Research Article

In-Text Citations: APA, MLA, Chicago & Harvard Guide (2026)

Learn how to format in-text citations in APA 7th, MLA 9, Chicago, and Harvard. Covers parenthetical, narrative, multiple authors, no author, multiple sources, and secondary sources.

In-text citations point readers to the full reference. APA: (Author, Year) or Author (Year). MLA: (Author Page). Chicago NB: Footnote number. Harvard: (Author, Year). Every in-text citation must have a matching entry in the reference list (and vice versa).

TL;DR: In-text citations point readers to the full reference. APA = (Author, Year). MLA = (Author Page). Chicago = Footnote. Harvard = (Author, Year). Every citation in the text must match an entry in the reference list.

In-text citations are the link between your claims and your evidence. Every time you reference a source — whether quoting, paraphrasing, or summarizing — you need an in-text citation. The format depends on your style guide.

| Style | In-Text Format | Example | |-------|---------------|---------| | APA 7 | (Author, Year) | (Smith, 2024) | | MLA 9 | (Author Page) | (Smith 45) | | Chicago NB | Superscript footnote | ...finding.¹ | | Harvard | (Author, Year) | (Smith, 2024) |

AI has transformed diagnostic accuracy in radiology (Smith, 2024).

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Frequently Asked Questions

What is an in-text citation?
An in-text citation is a brief reference within the body of your paper that tells readers where an idea, quote, or fact comes from. It typically includes the author's last name and either the year (APA, Harvard), page number (MLA), or a footnote number (Chicago). It points to the full citation in the reference list or bibliography.
What is the difference between parenthetical and narrative citations?
Parenthetical: Both author and date/page in parentheses at the end — (Smith, 2024). Narrative: Author's name is part of the sentence, only date/page in parentheses — Smith (2024) argued that... Both are correct; use narrative when the author matters to your point, parenthetical when only the idea matters.
How do I cite multiple sources in one sentence?
APA: List alphabetically, separated by semicolons — (Chen, 2023; Smith, 2024; Williams, 2022). MLA: Same — (Chen 45; Smith 102; Williams 78). Chicago: Combine in one footnote, separated by semicolons. Harvard: Alphabetically by year — (Chen, 2023; Smith, 2024; Williams, 2022).
How do I cite a source with no author?
APA: Use the title (italicized for books/reports, in quotes for articles) — ('Title of Article,' 2024). MLA: Use a shortened title in quotes — ('Shortened Title' 12). If an organization produced it, use the organization name as author.
What is a secondary source citation?
When you cite a source that was quoted or cited in another source (you haven't read the original). APA: (Original Author, Year, as cited in Secondary Author, Year). MLA: (qtd. in Secondary Author Page). Only the secondary source goes in the reference list. Avoid secondary citations when possible — find the original.
Do I need page numbers in in-text citations?
MLA: Yes, always for direct quotes and usually for paraphrases. APA: Required for direct quotes, encouraged for paraphrases. Chicago NB: Yes, in footnotes. Harvard: Required for direct quotes. If there are no page numbers (e.g., website), use paragraph number, heading, or section.

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