How to Avoid Plagiarism in Literature Review: A Detailed Guide

Glossary of Key Terms

What Is Plagiarism in a Literature Review?

Plagiarism in a literature review is presenting another author’s words, ideas, data, or structure as your own, whether on purpose or by accident, without a proper citation. It applies to full sentences, single phrases, and even the order in which you present someone else’s argument.

Most plagiarism in student and academic writing is not deliberate theft. It happens when a writer summarizes too quickly, forgets to add a citation, or leans too heavily on a source’s original sentence structure. The forms below all count as plagiarism, even when unintentional.

• Copying sentences or long phrases word for word without quotation marks.
• Patchwriting: changing a few words in a sentence but keeping its structure.
• Paraphrasing an idea correctly but forgetting to cite the source.
• Reusing your own previously published text without disclosure, known as self-plagiarism.
• Mosaic plagiarism: blending phrases from a source into your own sentence without marking them.

What Are the Main Types of Plagiarism to Avoid?

The 5 main types to avoid are direct copying, patchwriting, uncited paraphrase, mosaic plagiarism, and self-plagiarism. Each looks different on the page, but all of them remove credit from the original author.

How to Summarize a Source Without Plagiarizing

A safe summary captures only the main point of a source, written entirely in your own words and sentence structure, and always ends with a citation. Follow these 5 steps for every source you summarize.

Read the Full Source First

Read the complete source, not just the abstract or conclusion. Skimming only the opening or closing section often means you miss the nuance of the argument, which makes it harder to summarize accurately later.

Write from Memory, Not from the Page

Close the source after reading it, then write the main point from memory. This step is the single biggest safeguard against accidentally copying the author’s sentence structure or exact phrasing.

Identify the Core Claim

Pin down the author’s core claim, method, and key finding before you start writing your summary. If you cannot state these 3 elements in a sentence or 2, you are not ready to summarize the source yet.

Rebuild the Sentence in Your Own Words

Rebuild the sentence using your own structure and vocabulary rather than following the source’s original phrasing. Changing a few words while keeping the same sentence shape still counts as patchwriting, which is a form of plagiarism.

Add the Citation

Add a citation immediately, even though every word in your summary is your own. A citation is required whenever an idea or finding originates from someone else’s work, not only when you use their exact words.

Worked Example: Summarizing a Study

Original excerpt (invented study for illustration): “In our sample of 240 remote employees, self-reported productivity increased by 18% after companies introduced flexible scheduling, though the effect was strongest among employees with caregiving responsibilities.”

Poor summary (too close to the original): Flexible scheduling raised self-reported productivity by 18% among 240 remote employees, with the strongest effect for employees with caregiving duties (Lee, 2023).

Good summary (properly restated): Lee’s 2023 longitudinal study of 240 white-collar remote workers in mid-size tech firms in the US found that flexible scheduling was linked to higher self-reported productivity. This effect was strongest for staff balancing caregiving roles, which accounted for ~30% of the sample, and a weaker effect was observed for staff over age 50 years.

Note that further details about the study were added from the original paper to make the sample/subgroup characteristics and study design/setting clearer to readers of a literature review. This underscores the importance of reading the entire paper rather than “lifting” sentences from the abstract or discussion sections.

How to Paraphrase Effectively

Effective paraphrasing changes both the words and the sentence structure of the original, while preserving its meaning and adding a citation. A simple test is to set the source aside, write from understanding, then compare the 2 versions for overlap.

• Change the sentence order, not just individual words.
• Use synonyms only alongside a restructured sentence, never alone.
• Keep technical terms that have no true synonym, such as field-specific vocabulary.
• Compare your paraphrase side by side with the original to check for leftover phrasing.
• Add an in-text citation immediately after the paraphrased idea.

Worked Example: Paraphrasing a Sentence

Original sentence (invented for illustration): “Social media use among teenagers is strongly associated with disrupted sleep patterns, particularly when devices are used within 1 hour of bedtime.”

Weak paraphrase, patchwriting: Teenage social media use is closely linked to disrupted sleep, especially when devices are used within 1 hour before bed (Patel, 2022).

Strong paraphrase: In a study of 50 high school students (Patel, 2022), polysomnography data showed that participants who use social media within 1 hour of bedtime experienced higher sleep onset latency and more nocturnal awakenings lasting over 5 minutes.

How Do You Synthesize Multiple Papers Without Plagiarizing?

You synthesize multiple papers without plagiarizing by grouping sources around a shared theme, comparing their findings in your own words, and citing each source separately for its specific contribution. Synthesis is about the relationship between sources, not a list of separate summaries.

Two common approaches are thematic organization, where you group findings under an idea, and source-by-source organization, where you describe one paper at a time. Thematic organization is generally stronger for a literature review because it highlights agreement, disagreement, and gaps across the literature rather than treating each paper in isolation.

Worked Example: Synthesizing 3 Papers

Synthesized paragraph: Evidence on remote work and productivity is broadly positive but uneven across groups. Diaz (2021) reported a 12% rise in focus time among remote staff, and Nguyen (2022) linked hybrid schedules to lower burnout. However, Osei (2023) found that these gains were smaller for workers under 30, suggesting that age or career stage may shape how remote work affects performance.

See also: How to Write a Thematic Literature Review: A Beginner’s Guide

Citation and Attribution Best Practices

Citation is not only for direct quotations. It is required whenever an idea, statistic, method, or argument originates from someone else’s work, even if you have fully reworded it.

• Cite every paraphrase and every summary, not only direct quotes.
• Cite statistics and data points at the sentence where they appear.
• Include page numbers for direct quotations, per your citation style.
• Keep a running reference list as you write, rather than adding it at the end.
• Use a citation manager, such as Zotero, EndNote, or Mendeley, to reduce manual errors. Alternatively, use Paperpal’s Reference Finder and Citation Generator tools to automatically add citations and references perfectly formatted as you write your paper.

Common Plagiarism Mistakes and Fixes

Tools That Can Help Detect Plagiarism

Plagiarism-detection tools compare your draft against large databases of published work and flag matching text. They are useful safety checks, but they cannot detect uncited ideas or verify that a paraphrase is truly original in meaning.

• Turnitin: widely used by universities to scan student submissions.
• iThenticate: used by publishers for manuscript checks.
• Paperpal: offers a built-in plagiarism check alongside grammar review, perfect for students and researchers

Treat a low similarity score as a starting point, not proof of originality. A passage can be plagiarized in meaning and structure while still scoring low, if only individual words were changed.

A Pre-Submission Checklist

• Every paraphrase has been rewritten in your own sentence structure, not just resynonymized.
• Every summary ends with a citation to its source.
• Every direct quotation is in quotation marks with a page number.
• Sources are grouped by theme, with clear comparisons between them.
• Your own analysis, not just source content, appears in each paragraph.
• Self-plagiarism has been checked if you are reusing earlier work.
• A plagiarism-detection tool has been run on the full draft.
• Your reference list matches every in-text citation, with no missing entries.

Frequently Asked Questions

What is the difference between paraphrasing and summarizing in a literature review?

Paraphrasing restates a specific passage in your own words at roughly the same length, while summarizing condenses an entire source, or a large section of it, into a much shorter overview. Both require a citation and original sentence structure.

How much of a literature review can be quoted directly before it counts as plagiarism?

There is no fixed word count, but most style guides and instructors expect direct quotations to be rare and short. A review built mainly from quotations, rather than your own paraphrased analysis, is generally seen as poor practice even when every quote is cited.

Can I get flagged for plagiarism if I paraphrase too closely to the original text?

Yes. If a paraphrase keeps the source’s sentence structure and only swaps a few words, this is called patchwriting, and detection tools and instructors can flag it even when a citation is present. True paraphrasing requires restructuring the sentence, not just replacing vocabulary.

Do I need to cite common knowledge in a literature review?

No. Facts that are widely known and not attributed to a single source, such as basic historical dates, generally do not require a citation. If a fact, statistic, or finding comes from a specific study, it needs a citation even if it later becomes widely repeated.

What percentage of similarity is acceptable in a Turnitin report for a literature review?

Acceptable thresholds vary by institution, but a lower similarity score is generally safer, since quoted material, references, and common phrases still count toward the total. Always check your specific institution’s guidance rather than relying on a single universal number.

How do I avoid self-plagiarism when reusing my own previous research?

Disclose to your instructor or editor that you are reusing earlier material, and cite your own prior work just as you would cite another author. Rewriting the passage in new words is still recommended, since simply copying your own past text without disclosure can violate academic integrity policies.

What is patchwriting and why is it considered plagiarism?

Patchwriting is lightly editing a source’s sentence, such as swapping a few words or reordering a clause, while keeping its original structure intact. It counts as plagiarism because the sentence still belongs, in structure and logic, to the original author, even though some wording has changed.

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This article was originally published on November 13, 2023, and updated on July 9, 2026.