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Reference management. Clean and simple.

The top list of academic search engines

1. Google Scholar

4. science.gov, 5. semantic scholar, 6. baidu scholar, get the most out of academic search engines, frequently asked questions about academic search engines, related articles.

Academic search engines have become the number one resource to turn to in order to find research papers and other scholarly sources. While classic academic databases like Web of Science and Scopus are locked behind paywalls, Google Scholar and others can be accessed free of charge. In order to help you get your research done fast, we have compiled the top list of free academic search engines.

Google Scholar is the clear number one when it comes to academic search engines. It's the power of Google searches applied to research papers and patents. It not only lets you find research papers for all academic disciplines for free but also often provides links to full-text PDF files.

• Coverage: approx. 200 million articles
• Abstracts: only a snippet of the abstract is available
• Related articles: ✔
• References: ✔
• Cited by: ✔
• Links to full text: ✔
• Export formats: APA, MLA, Chicago, Harvard, Vancouver, RIS, BibTeX

BASE is hosted at Bielefeld University in Germany. That is also where its name stems from (Bielefeld Academic Search Engine).

• Coverage: approx. 136 million articles (contains duplicates)
• Abstracts: ✔
• Related articles: ✘
• References: ✘
• Cited by: ✘
• Export formats: RIS, BibTeX

CORE is an academic search engine dedicated to open-access research papers. For each search result, a link to the full-text PDF or full-text web page is provided.

• Coverage: approx. 136 million articles
• Links to full text: ✔ (all articles in CORE are open access)
• Export formats: BibTeX

Science.gov is a fantastic resource as it bundles and offers free access to search results from more than 15 U.S. federal agencies. There is no need anymore to query all those resources separately!

• Coverage: approx. 200 million articles and reports
• Links to full text: ✔ (available for some databases)
• Export formats: APA, MLA, RIS, BibTeX (available for some databases)

Semantic Scholar is the new kid on the block. Its mission is to provide more relevant and impactful search results using AI-powered algorithms that find hidden connections and links between research topics.

• Coverage: approx. 40 million articles
• Export formats: APA, MLA, Chicago, BibTeX

Although Baidu Scholar's interface is in Chinese, its index contains research papers in English as well as Chinese.

• Coverage: no detailed statistics available, approx. 100 million articles
• Abstracts: only snippets of the abstract are available
• Export formats: APA, MLA, RIS, BibTeX

RefSeek searches more than one billion documents from academic and organizational websites. Its clean interface makes it especially easy to use for students and new researchers.

• Coverage: no detailed statistics available, approx. 1 billion documents
• Abstracts: only snippets of the article are available
• Export formats: not available

Consider using a reference manager like Paperpile to save, organize, and cite your references. Paperpile integrates with Google Scholar and many popular databases, so you can save references and PDFs directly to your library using the Paperpile buttons:

Google Scholar is an academic search engine, and it is the clear number one when it comes to academic search engines. It's the power of Google searches applied to research papers and patents. It not only let's you find research papers for all academic disciplines for free, but also often provides links to full text PDF file.

Semantic Scholar is a free, AI-powered research tool for scientific literature developed at the Allen Institute for AI. Sematic Scholar was publicly released in 2015 and uses advances in natural language processing to provide summaries for scholarly papers.

BASE , as its name suggest is an academic search engine. It is hosted at Bielefeld University in Germany and that's where it name stems from (Bielefeld Academic Search Engine).

CORE is an academic search engine dedicated to open access research papers. For each search result a link to the full text PDF or full text web page is provided.

Science.gov is a fantastic resource as it bundles and offers free access to search results from more than 15 U.S. federal agencies. There is no need any more to query all those resources separately!

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10 Best Online Websites and Resources for Academic Research

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• Finding credible sources for academic research can be a major challenge for many college students.
• A growing number of online databases and libraries offer millions of potential sources.
• The university library helps students access restricted academic sources.
• Discover new online resources to make your next research project more efficient.

Every college student conducts research at some point. And professors have strong views on what counts as a credible academic resource. Choosing the wrong sources can hurt your grade.

So how can you conduct research efficiently while avoiding sleepless nights in the campus library? Online academic research websites make it easier to find reliable sources quickly.

College students conduct academic research in all kinds of disciplines, including science, history, literature, engineering, and education. And when it comes to college research papers , academic resources are the best sources.

Rather than pulling random facts from the internet — and running into problems with citations — college students need to know how to find credible sources and how to use online academic tools. Keep reading to learn how you can find the best credible sources for your college research needs.

How to Find Credible Sources for Research

How can you find credible sources for research and avoid misinformation? Your instructor likely recommends avoiding general web content or Wikipedia.

Finding the most reliable websites for research starts with evaluating the website itself. Sites run by academic or government organizations rank high in reliability. Databases and specialized search engines can also provide good research sources.

Next, make sure you understand the source of the information and the process used to publish it. Scholarly articles and books that undergo peer review make for the best academic resources.

Finally, when in doubt, check with your instructor or an academic librarian. They can help point you to reliable sources or double-check sources you're unsure about.

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The 10 Best Academic Research Sources

What resources will point you toward reliable sources for your academic research? Rather than scrolling through pages of search results, turn to these academic resources when you need to find sources.

1. Google Scholar

Looking for an academic article, thesis , or abstract? Google Scholar should be your first stop. Google Scholar helps you find related works, locate full documents at your school library , and access scholarly research.

While Google created Google Scholar, it's very different from a general online search. Google Scholar brings together academic articles and ranks them based on the authors, publication location, and citation record. That means the top results generally represent the most reliable scholarship on your topic.

For journal articles, books, images, and even primary sources, JSTOR ranks among the best online resources for academic research. JSTOR's collection spans 75 disciplines, with strengths in the humanities and social sciences . The academic research database includes complete runs of over 2,800 journals.

And if you're looking for images, turn to Artstor , which offers over 2.5 million images related to the arts, sciences, and literature. However, JSTOR is not an open-access database. That means you'll need to log in through your university library, which typically includes off-campus access .

3. Library of Congress

As the largest library in the world, the Library of Congress is an amazing online resource for academic research. Students can search its collections to access digital resources, videos, audio recordings, photographs, and maps.

The library's materials also include notated music, web archives, legislation, and 3D objects. You'll find materials for almost any topic in its extensive collections. You can search historic American newspapers from 1777-1963 with the Chronicling America tool or look up pirate trials in another digital collection.

4. PubMed Central

The National Library of Medicine, part of the U.S. National Institutes of Health, runs PubMed Central. Founded in 2000, the database includes academic scholarship dating back to the 18th century. The resource connects college students with life sciences and biomedical academic sources.

And as an open-access database, PubMed Central offers free access to scholarly literature. Today, PubMed Central has over 7 million full-text records, making it a great resource for students in the life sciences or medical fields.

5. Google Books

Whether you're looking for a recent publication or an out-of-print book, there's a good chance you'll find it on Google Books. In 2019, Google announced that Google Books contains over 40 million books .

You can enter any search term to find books that contain matches. And you can download the full text of any book in the public domain — which includes 10 million titles. Make sure to check publisher and author information when using Google Books.

The site also includes reference pages that link to book reviews. Keep in mind that you'll have more limited access to recent books. Still, Google Books is a great first step to find sources that you can later look for at your campus library.

6. Science.gov

If you're looking for scientific research, Science.gov is a great option. The site provides full-text documents, scientific data, and other resources from federally funded research.

A U.S. government site, Science.gov searches more than 60 databases and 2,200 scientific websites. You'll find over 200 million pages of research and development information, including projects funded by 14 federal agencies. Students in any STEM field can benefit from the resource.

7. Digital Commons Network

University librarians curate the Digital Commons Network, which connects students with peer-reviewed articles. The site's other resources include dissertations, book chapters, conference proceedings, and working papers.

The Digital Commons Network includes scholarly work from diverse disciplines like architecture, business, education, law, and the sciences. You can also access humanities, social sciences, and engineering scholarship through the network.

8. ResearchGate

ResearchGate has been described as social networking for research scientists. But ResearchGate is also a great option to find open-access academic sources. Scholars upload their work to ResearchGate, which makes it available to the public for free.

Currently, over 20 million researchers around the world use the site, which contains over 135 million publications. College students looking for scientific research can often find resources on ResearchGate and even connect with scholars.

9. WorldCat

When you're looking for library resources, WorldCat is one of the best tools. Connected to over 10,000 libraries, WorldCat is a database that allows you to search library collections.

The database lists books and articles available at your local libraries, making it easier to find materials that are not available online. In addition to books, WorldCat contains music, videos, audiobooks, and scholarly articles.

You can also find digital research materials, including photos. When you're logged into WorldCat through your university library, you can also access full-text articles and other resources. Or you can use WorldCat to find sources to request through interlibrary loan.

10. Your University Library

When you're conducting academic research, your university library can be one of your best resources. In addition to online databases, journal articles, and books, your campus library also has academic librarians who can point you to the best sources.

When you don't know where to start, reach out to an academic librarian to learn more about your school's research tools. Or use interlibrary loan to get a scanned copy of an article. Many of the campus library's resources are available online, making them easy to access.

How to Access Academic Resources

Many sites offer open-access resources. That means anyone can access the materials. Other sites restrict what you can read. For example, you might find some blank pages when searching on Google Books because of copyright restrictions. And many academic articles are behind paywalls.

Fortunately, college students benefit from one of the best resources for conducting research: the university library. Your library likely subscribes to multiple academic databases and journals. If you run into a paywall, check whether your library offers access to the resource.

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• 15 April 2024

Revealed: the ten research papers that policy documents cite most

• Dalmeet Singh Chawla 0

Dalmeet Singh Chawla is a freelance science journalist based in London.

You can also search for this author in PubMed   Google Scholar

Policymakers often work behind closed doors — but the documents they produce offer clues about the research that influences them. Credit: Stefan Rousseau/Getty

When David Autor co-wrote a paper on how computerization affects job skill demands more than 20 years ago, a journal took 18 months to consider it — only to reject it after review. He went on to submit it to The Quarterly Journal of Economics , which eventually published the work 1 in November 2003.

Autor’s paper is now the third most cited in policy documents worldwide, according to an analysis of data provided exclusively to Nature . It has accumulated around 1,100 citations in policy documents, show figures from the London-based firm Overton (see ‘The most-cited papers in policy’), which maintains a database of more than 12 million policy documents, think-tank papers, white papers and guidelines.

“I thought it was destined to be quite an obscure paper,” recalls Autor, a public-policy scholar and economist at the Massachusetts Institute of Technology in Cambridge. “I’m excited that a lot of people are citing it.”

The most-cited papers in policy

Economics papers dominate the top ten papers that policy documents reference most.

Data from Sage Policy Profiles as of 15 April 2024

The top ten most cited papers in policy documents are dominated by economics research. When economics studies are excluded, a 1997 Nature paper 2 about Earth’s ecosystem services and natural capital is second on the list, with more than 900 policy citations. The paper has also garnered more than 32,000 references from other studies, according to Google Scholar. Other highly cited non-economics studies include works on planetary boundaries, sustainable foods and the future of employment (see ‘Most-cited papers — excluding economics research’).

These lists provide insight into the types of research that politicians pay attention to, but policy citations don’t necessarily imply impact or influence, and Overton’s database has a bias towards documents published in English.

Interdisciplinary impact

Overton usually charges a licence fee to access its citation data. But last year, the firm worked with the London-based publisher Sage to release a free web-based tool that allows any researcher to find out how many times policy documents have cited their papers or mention their names. Overton and Sage said they created the tool, called Sage Policy Profiles, to help researchers to demonstrate the impact or influence their work might be having on policy. This can be useful for researchers during promotion or tenure interviews and in grant applications.

Autor thinks his study stands out because his paper was different from what other economists were writing at the time. It suggested that ‘middle-skill’ work, typically done in offices or factories by people who haven’t attended university, was going to be largely automated, leaving workers with either highly skilled jobs or manual work. “It has stood the test of time,” he says, “and it got people to focus on what I think is the right problem.” That topic is just as relevant today, Autor says, especially with the rise of artificial intelligence.

Most-cited papers — excluding economics research

When economics studies are excluded, the research papers that policy documents most commonly reference cover topics including climate change and nutrition.

Walter Willett, an epidemiologist and food scientist at the Harvard T.H. Chan School of Public Health in Boston, Massachusetts, thinks that interdisciplinary teams are most likely to gain a lot of policy citations. He co-authored a paper on the list of most cited non-economics studies: a 2019 work 3 that was part of a Lancet commission to investigate how to feed the global population a healthy and environmentally sustainable diet by 2050 and has accumulated more than 600 policy citations.

“I think it had an impact because it was clearly a multidisciplinary effort,” says Willett. The work was co-authored by 37 scientists from 17 countries. The team included researchers from disciplines including food science, health metrics, climate change, ecology and evolution and bioethics. “None of us could have done this on our own. It really did require working with people outside our fields.”

Sverker Sörlin, an environmental historian at the KTH Royal Institute of Technology in Stockholm, agrees that papers with a diverse set of authors often attract more policy citations. “It’s the combined effect that is often the key to getting more influence,” he says.

Has your research influenced policy? Use this free tool to check

Sörlin co-authored two papers in the list of top ten non-economics papers. One of those is a 2015 Science paper 4 on planetary boundaries — a concept defining the environmental limits in which humanity can develop and thrive — which has attracted more than 750 policy citations. Sörlin thinks one reason it has been popular is that it’s a sequel to a 2009 Nature paper 5 he co-authored on the same topic, which has been cited by policy documents 575 times.

Although policy citations don’t necessarily imply influence, Willett has seen evidence that his paper is prompting changes in policy. He points to Denmark as an example, noting that the nation is reformatting its dietary guidelines in line with the study’s recommendations. “I certainly can’t say that this document is the only thing that’s changing their guidelines,” he says. But “this gave it the support and credibility that allowed them to go forward”.

Broad brush

Peter Gluckman, who was the chief science adviser to the prime minister of New Zealand between 2009 and 2018, is not surprised by the lists. He expects policymakers to refer to broad-brush papers rather than those reporting on incremental advances in a field.

Gluckman, a paediatrician and biomedical scientist at the University of Auckland in New Zealand, notes that it’s important to consider the context in which papers are being cited, because studies reporting controversial findings sometimes attract many citations. He also warns that the list is probably not comprehensive: many policy papers are not easily accessible to tools such as Overton, which uses text mining to compile data, and so will not be included in the database.

The top 100 papers

“The thing that worries me most is the age of the papers that are involved,” Gluckman says. “Does that tell us something about just the way the analysis is done or that relatively few papers get heavily used in policymaking?”

Gluckman says it’s strange that some recent work on climate change, food security, social cohesion and similar areas hasn’t made it to the non-economics list. “Maybe it’s just because they’re not being referred to,” he says, or perhaps that work is cited, in turn, in the broad-scope papers that are most heavily referenced in policy documents.

As for Sage Policy Profiles, Gluckman says it’s always useful to get an idea of which studies are attracting attention from policymakers, but he notes that studies often take years to influence policy. “Yet the average academic is trying to make a claim here and now that their current work is having an impact,” he adds. “So there’s a disconnect there.”

Willett thinks policy citations are probably more important than scholarly citations in other papers. “In the end, we don’t want this to just sit on an academic shelf.”

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Paraphrasing for Better Research Papers: A Step-by-Step Guide

Research papers rely on other people’s writing as a foundation to create new ideas, but you can’t just use someone else’s words. That’s why paraphrasing is an essential writing technique for academic writing .

Paraphrasing rewrites another person’s ideas, evidence, or opinions in your own words. With proper attribution, paraphrasing helps you expand on another’s work and back up your own ideas with information from other sources while retaining your own writing style and tone.

Work smarter with Grammarly The AI writing partner for anyone with work to do Get Grammarly

In this guide to paraphrasing, we explain how to strengthen your research papers through the art and craft of paraphrasing. We discuss the rules of ethical paraphrasing and share paraphrasing tips to help you get started. We even provide a few paraphrasing examples to illustrate how to do it yourself.

Why should you paraphrase in a research paper?

There are a few reasons research writers rely on paraphrasing in their papers:

• It shows comprehension. Paraphrasing requires you to understand ideas well enough to write them in your own words, so it not only helps you pass on information but also can help you learn and retain it.
• Paraphrasing other research or another writer’s work allows you to make valuable connections between ideas. Crediting your sources ethically and according to standards shows professional collaboration and respect.
• Paraphrasing can transform dense academic language into clearer or more modern text. Research writers employ it to make important information more understandable to a wider audience.
• Paraphrasing can increase the readability of your paper and make impactful direct quotes stand out.

When should paraphrasing be used in a research paper?

Paraphrasing is best used in concert with other research writing techniques, such as direct quotes and summaries. Here are instances when paraphrasing is appropriate for your research paper:

• Opt for paraphrasing when you can explain the same concept in plainer language or with less jargon.
• Paraphrasing works best when you need to share background information. Save direct quotes for striking statements and opinions. Rely on your own words to set the stage or provide context.
• Similarly, methodology from published studies generally doesn’t require direct quotes. Consider rewriting this contextual information in your own words.
• Paraphrasing also works well when you’re reporting key results from other research. You might restate the results by paraphrasing the main findings and then use a direct quote to share opinions about the value gleaned from the research.

Paraphrasing vs. quoting and summarizing

Unlike summarizing, paraphrasing uses roughly the same amount of detail as the original work but adjusts the language to demonstrate comprehension or make the text more understandable. Summarizing, in contrast, shortens the information to only the most important points.

While paraphrasing uses your own phrasing, quoting transcribes someone else’s words exactly, placing them in quotation marks so the reader knows someone else said them.

Direct quotes work best when you’re dealing with striking statements or opinions or when you want the tone of the original work to shine. Opt for paraphrasing when you can convey the same information in plain language. Sometimes, placing a direct quote in a sentence would lead to an error in subject-verb agreement or pronoun agreement, so paraphrasing works better in that case. Paraphrasing can also help modernize outdated wording, such as gendered language.

Generally, your writing will have the most readability and engagement if you strike a balance between paraphrasing and direct quotes.

Common paraphrasing mistakes

Writers risk committing plagiarism or losing clarity when they commit the following common paraphrasing mistakes:

• Substituting synonyms but not otherwise changing the phrasing
• Altering the original meaning
• Failing to add citations within the text and in the bibliography

Tips for paraphrasing successfully in your research paper

Try to rewrite from memory.

It can be difficult to reword a passage when you’re staring at it. Sometimes it can help to jot down notes about a passage and then try to rewrite the same sentiment from scratch. This forces your brain to think creatively because you can’t just copy the passage verbatim.

Focus on meaning, not just vocabulary

Paraphrasing is more than just swapping out words for their synonyms; you need to completely rewrite a sentence in your own style. Pay close attention to what the original author is trying to say as a whole, rather than focusing on the individual words. You may find yourself changing phrases or clauses. You may even come up with a way to restate the whole idea in a clearer or more concise way.

Change or update the language

Use synonyms to replace the essential words of an original passage with other words that mean the same thing, such as using “scientist” for “researcher,” or “seniors” for “the elderly.” You can also pay special attention to modernizing and broadening the language, such as for more gender inclusivity. This is a common approach to paraphrasing, although it’s not sufficient on its own.

Edit the sentence structure

Editing the sentence structure by rearranging the order of certain phrases and clauses or combining or breaking apart sentences is another strategy for paraphrasing. But if you do this, be careful not to overuse the passive voice.

Sometimes, you can rephrase a sentence by changing the parts of speech, such as converting a gerund into an operative verb or turning an adjective into an adverb . This strategy depends on the wording of the original passage, so you may not always have the opportunity.

Often, using only one of these techniques is not enough to differentiate your paraphrase from the source material. Try combining a few of these techniques on the same passage to set it apart.

Use transition phrasing

Some introductory and transitional phrases let your reader know you’re about to paraphrase an existing work. This tactic has the added benefit of helping you rewrite key findings by recasting the sentence structure with a new subject. Here are a few examples:

• Research shows that . . .
• A recent study found that . . .
• According to [author]’s analysis . . .
• Thanks to [source], we now know that . . .

Avoid patchwriting

If you don’t change enough of the original, it leaves “patches” of the source text that are easily identifiable to anyone who’s read it. This is known as patchwriting , and it’s a big problem with paraphrasing. Double-check to see if your paraphrase is unique enough with our free plagiarism checker .

Use ethical paraphrasing tools

Use Grammarly’s free paraphrasing tool to quickly paraphrase text with the help of generative AI. Paste the text into Grammarly to get options for how to paraphrase it instantly, then use our citations generator to get the proper attribution.

Learn about other aspects of research paper writing by browsing Grammarly’s research paper guides and resources .

Paraphrasing examples

Paraphrasing a research paper to avoid plagiarism.

Plagiarism refers to claiming another person’s ideas or words as your own. Paraphrasing alone is not enough to avoid plagiarism—if the words are different but the ideas are the same, you have to do more. That’s why citing paraphrases is not just morally right, it’s also a mandatory part of how to write a research paper , regardless of the research paper topic .

In academic writing, paraphrases typically use parenthetical citations , a type of in-text citation that places the author’s last name in parentheses, along with the year of publication or page number. Parenthetical citations are placed at the end of a passage, before the ending punctuation.

Additionally, you need to include a full citation for any source you use in the bibliography section at the end of the research paper. A full citation includes all the necessary details the reader needs to track down the source, such as the full title, the publication year, and the name of the publisher.

The information to include in both parenthetical and full citations depends on which formatting style you’re using: APA , MLA , or Chicago . Refer to our guides to learn more about how to properly cite your paraphrasing in whatever style you prefer.

If you’re still having trouble citing paraphrases, you can use our free citation generator to save time.

How to paraphrase for a research paper FAQs

When should you use paraphrasing in research writing.

If you want to use someone else’s ideas in your research paper, you can either paraphrase or quote them. Paraphrasing works best when the original wording has room for improvement or doesn’t fit in with the rest of your paper. Quoting is best when the original wording is already perfect.

What techniques can you use for paraphrasing practice?

The most common paraphrasing technique is using synonyms to replace some of the original words. That only gets you so far, though; also consider rearranging the sentence structure, adding/removing parts of the original, or changing some of the parts of speech (like turning a verb into a noun).

Do research paper paraphrasing rules change for different citation styles?

The rules for paraphrasing are always the same—but the rules for citations change a lot between styles. Review the citation guidelines for the formatting style you’re using, whether APA, MLA, or Chicago.

Can I paraphrase sources with no named author, like websites?

Yes, you can paraphrase websites, but ensure they are reputable. And you still need to cite the source according to the citation guidelines.

What’s the best way to integrate paraphrased information smoothly in my paper’s flow?

Transitional phrases can help you introduce paraphrased information. Try using language such as:

Use paraphrasing alongside other writing devices, such as direct quotes or summaries, to help your paper flow naturally.

Is it acceptable to paraphrase content from my own previous papers?

Yes, you can paraphrase your other content, unless your academic institution has a policy against it. You should still cite the original source material, even though it is your own work.

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