How to cite evidence in an essay: examples, sentence starters and rules

This guide is for middle school, high school and college students writing essays, lab reports and research papers. It covers what teachers mean by "cite evidence", 30 sentence starters, the claim-evidence-reasoning model, and MLA and APA examples. For finding and formatting sources with AI, see our guide to the AI citation generator.

What does it mean to cite evidence?

To cite evidence means to support a claim with specific information from a source and to identify that source so a reader can check it. It has two parts: the evidence in your sentence, and the citation that points to where you found it.

What counts as evidence depends on the class:

The US Common Core standards use this language from early grades. Grade 8 reading asks students to "cite the textual evidence that most strongly supports an analysis of what the text says explicitly as well as inferences drawn from the text" [1]. Grade 8 writing asks for arguments supported by "relevant evidence, using accurate, credible sources" [2].

Should you quote, paraphrase or summarize?

Use a quotation when the exact words matter, a paraphrase when the idea matters, and a summary when you need the main point of a longer passage. All three need a citation [3].

A paraphrase is a restatement of a source's idea in your own words and sentence structure, with a citation. Swapping a few words for synonyms is not a paraphrase. Read the passage, close it, write the idea from memory, then check your version against the original.

How do you cite evidence in an essay?

Use the same five steps every time you bring in evidence. Teachers sometimes call the middle steps a "quote sandwich": introduce, cite, explain.

1. State your claim in your own words at the start of the paragraph.
2. Introduce the evidence with a signal phrase that names the source: "According to Mueller and Oppenheimer..."
3. Give the evidence: the quotation in quotation marks, the paraphrase, or the number.
4. Add the in-text citation right after it, in your teacher's style: (Mueller and Oppenheimer 1159) in MLA, (Mueller & Oppenheimer, 2014, p. 1159) in APA.
5. Explain it. Write one or two sentences on how this evidence supports your claim. This is the step most students skip.

Finally, list the full source at the end, in a works cited page (MLA) or reference list (APA).

What is the claim-evidence-reasoning (CER) model?

Claim-evidence-reasoning (CER) is a way of building an argument in three parts: a claim that answers the question, evidence that supports it, and reasoning that explains why the evidence supports the claim. It is widely used in science classes. In one study, McNeill and colleagues taught it to 331 seventh-grade chemistry students, who made significant gains in all three parts of their written explanations [4].

• Claim: a statement that answers the question. One sentence.
• Evidence: specific, relevant information from a text, a study or your data.
• Reasoning: the link between them, often a rule, principle or definition.

Worked example: a CER paragraph

Question: Should students take class notes by hand or on a laptop?

Claim: Students should not assume handwritten notes are always better than laptop notes. Evidence: In a well-known 2014 study, students who typed notes did worse on conceptual questions than students who wrote by hand, and the authors argued that "laptop note takers' tendency to transcribe lectures verbatim rather than processing information and reframing it in their own words is detrimental to learning" (Mueller and Oppenheimer 1159). However, a 2021 direct replication with 142 participants found that the results "do not support the idea that longhand note taking improves immediate learning via better encoding of information" (Urry et al. 326). Reasoning: When a careful repeat of a study does not find the same effect, the original finding is less certain. The method of note taking may matter less than whether students put ideas into their own words.

The labels show the parts; drop them in your essay. The reasoning does what the evidence cannot: it says what the two studies mean together.

30 sentence starters for citing evidence

Change the verb to fit what the source does: a source that argues is different from one that reports.

Introducing a quotation

1. According to [author], "..."
2. As [author] writes in [title], "..."
3. In [title], [author] states that "..."
4. [Author] argues that "..."
5. The narrator describes [X] as "..."
6. [Character] reveals [trait] when she says, "..."
7. In the words of [author], "..."
8. The text states, "..."

Introducing a paraphrase or summary

9. [Author] explains that...
10. [Author] suggests that...
11. [Author] points out that...
12. In [year], [author] found that...
13. The article reports that...
14. Researchers at [institution] concluded that...

Introducing data

15. A [year] study of [number] students found that...
16. According to data from [source],...
17. The results show that [X] increased from [A] to [B]...
18. In my experiment, the data show that...
19. As the table in [source] shows,...

Introducing evidence that disagrees

20. However, [author] found that...
21. Not all research agrees: [author] reports that...
22. A later study by [author] did not find...
23. Critics such as [author] argue that...
24. In contrast, [author] claims that...

Explaining the evidence (reasoning)

25. This shows that...
26. This suggests that...
27. This evidence supports the claim because...
28. In other words,...
29. This matters because...
30. This is important because it reveals...

How do you cite the source correctly in MLA and APA?

Your teacher will usually name a style: MLA 9 in English and humanities classes, APA 7 in psychology, education and many college courses. Both use a short citation in the sentence and a full entry at the end. Here is the same real study [11] in each.

Full entry in MLA 9 (works cited) [5][6]:

Mueller, Pam A., and Daniel M. Oppenheimer. "The Pen Is Mightier Than the Keyboard: Advantages of Longhand over Laptop Note Taking." Psychological Science, vol. 25, no. 6, 2014, pp. 1159–68, https://doi.org/10.1177/0956797614524581.

Full entry in APA 7 (reference list) [7]:

Mueller, P. A., & Oppenheimer, D. M. (2014). The pen is mightier than the keyboard: Advantages of longhand over laptop note taking. Psychological Science, 25(6), 1159–1168. https://doi.org/10.1177/0956797614524581

Three rules from the MLA in-text guidelines [5]:

• No comma between the author and the page: (Burke 3), not (Burke, 3).
• If you name the author in your sentence, put only the page in parentheses.
• With no page numbers, as on most websites, leave the page out.

For textual evidence from a novel or play, MLA uses the author and page for prose, (Author 112), and act, scene and line for verse plays. For more formats, including preprints, IEEE and Chicago, see how to cite a research paper.

Check your sources before you cite them

Evidence is only as good as its source. Before you cite something, check who made it, whether others agree, and whether you are quoting the original. SIFT is a four-step method for checking sources: Stop, Investigate the source, Find better coverage, Trace claims to the original [8].

1. Stop. Before you use the source, ask if you know what it is.
2. Investigate the source. Who wrote it, and what is their expertise or agenda? Search the author or site name in a new tab.
3. Find better coverage. Do other reliable sources report the same thing?
4. Trace claims to the original. If a website says "studies show", find the study. Cite what you actually read.

The note-taking example shows why step 3 matters. The 2014 study was widely shared as proof that handwriting beats laptops. Two later replications found mixed results or no clear advantage for handwriting [9][10]. A student who checked found the fuller picture, and a stronger essay.

Do not cite an AI chatbot's answer as evidence; find and cite the source it is based on, if one exists.

Common mistakes when citing evidence

• Dropped quotes: a quotation standing alone as a sentence with no introduction.
• No explanation: evidence followed straight by the next point.
• Too much quoting: if more than about a quarter of a paragraph is quotation, paraphrase some of it.
• Cherry-picking: quoting one line that seems to agree while the source as a whole says something else.

How to find and cite evidence with AI for Research

AI for Research searches real published papers, so every source it suggests is one you can open and check. Check your school's rules on AI before you use it.

1. Find sources (0 credits). Search 250M+ scholarly works in Find Papers, with filters for year, study type and peer-reviewed only. Retracted papers are excluded by default.
2. Get a short cited answer (1 credit). Ask a question in Deep Research at Summary depth. You get a short answer where each citation points to a real paper, which you then open and read. See deep research.
3. Check your claims (2 credits). In the editor, Claim check reads a paragraph and labels up to 10 claims as supported, partly supported, not supported or no evidence, with the papers.
4. Format the citation (0 credits). Paste a DOI or title into the free citation generator for MLA, APA or 10,000+ other styles.

The free plan includes 45 credits a month; search and citations cost nothing. See pricing. Limits: it searches scholarly papers, not your class novel or textbook, so textual evidence from a set text is still yours to find. It does not write your reasoning, and a label is a starting point, not a grade: read the source before you rely on it.

FAQ

What does it mean to cite evidence?

To cite evidence means to back up a point with specific information from a source, such as a quotation, a fact or a statistic, and to say where it came from. In English class the source is usually the text you are reading. In research essays it is a book, article or study. Citing has two parts: the evidence in your sentence and a citation that lets a reader find it.

How do you cite evidence in an essay?

Make your claim, introduce the evidence with a sentence starter such as 'According to', give the quotation, paraphrase or data, and add an in-text citation in your style, such as (Mueller and Oppenheimer 1159) in MLA. Then explain in one or two sentences how the evidence supports your claim. List the full source in your works cited or reference list.

How many pieces of evidence should be in a paragraph?

Most body paragraphs need one or two pieces of evidence, each followed by your explanation. One strong, specific piece that you explain well is better than three quotations stacked together. If your teacher gives a rule, such as two quotations per paragraph, follow it. A paragraph with evidence but no explanation, or explanation but no evidence, is incomplete.

What is the difference between evidence and reasoning?

Evidence is the information from a source: the quote, the data or the example. Reasoning is your explanation of why that evidence supports your claim, often using a rule, a definition or a principle. In the claim-evidence-reasoning model, teachers look for the reasoning because it shows your thinking. A quote dropped in with no reasoning does not prove anything by itself.

Can I use AI to find evidence for my essay?

Check your school's rules first. Where AI is allowed, use a tool that searches real sources and shows you the paper or page, never a chatbot that writes references from memory, because those can be made up. Open every source it suggests, read the passage yourself, and quote or paraphrase it accurately. You are still responsible for every citation.

Next steps

• Format any source in APA, MLA, Chicago, IEEE or Vancouver: how to cite a research paper.
• Test whether a study really supports your point: how to check a claim against the research.
• Why AI-made references go wrong: AI citation generator.

Sources

1. Common Core State Standards Initiative. English Language Arts Standards, Reading: Literature, Grade 8 (RL.8.1). https://www.thecorestandards.org/ELA-Literacy/RL/8/
2. Common Core State Standards Initiative. English Language Arts Standards, Writing, Grade 8 (W.8.1, W.8.8). https://www.thecorestandards.org/ELA-Literacy/W/8/
3. Purdue OWL. Quoting, paraphrasing, and summarizing. https://owl.purdue.edu/owl/research_and_citation/using_research/quoting_paraphrasing_and_summarizing/index.html
4. McNeill, K. L., Lizotte, D. J., Krajcik, J., & Marx, R. W. (2006). Supporting students' construction of scientific explanations by fading scaffolds in instructional materials. Journal of the Learning Sciences, 15(2), 153–191. https://doi.org/10.1207/s15327809jls1502_1
5. Purdue OWL. MLA in-text citations: the basics. https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_in_text_citations_the_basics.html
6. MLA Style Center. Works cited: a quick guide. https://style.mla.org/works-cited/works-cited-a-quick-guide/
7. APA Style. Journal article references. https://apastyle.apa.org/style-grammar-guidelines/references/examples/journal-article-references
8. Caulfield, M. (2019). SIFT (the four moves). Hapgood. https://hapgood.us/2019/06/19/sift-the-four-moves/
9. Morehead, K., Dunlosky, J., & Rawson, K. A. (2019). How much mightier is the pen than the keyboard for note-taking? A replication and extension of Mueller and Oppenheimer (2014). Educational Psychology Review, 31(3), 753–780. https://doi.org/10.1007/s10648-019-09468-2
10. Urry, H. L., et al. (2021). Don't ditch the laptop just yet: A direct replication of Mueller and Oppenheimer's (2014) Study 1 plus mini meta-analyses across similar studies. Psychological Science, 32(3), 326–339. https://doi.org/10.1177/0956797620965541
11. Mueller, P. A., & Oppenheimer, D. M. (2014). The pen is mightier than the keyboard: Advantages of longhand over laptop note taking. Psychological Science, 25(6), 1159–1168. https://doi.org/10.1177/0956797614524581