How to Format In-Text Citations in APA, MLA, and Chicago
Author-date, author-page, or footnotes: the in-text citation rules for APA 7th, MLA 9th, and Chicago 17th with examples of each pattern.
In-text citation mechanics differ fundamentally across academic traditions: APA uses author-date parentheticals, MLA enforces author-page citations, and Chicago utilizes superscript numerals linked to footnotes. Mastering the exact punctuation, signal phrase syntax, and multi-author abbreviations for each style prevents pervasive attribution errors.
Three citation systems, one source of confusion
In-text citations fail in predictable ways: APA punctuation drifting into an MLA paper, page numbers appearing where years belong, and footnotes mixed with parentheticals. Each style runs a different system, and the systems do not share habits.
This guide states the core pattern for each style and the variations you will actually hit while writing.
The Three Systems at a Glance
| Aspect | APA 7th | MLA 9th | Chicago 17th |
|---|---|---|---|
| System | Author-date | Author-page | Footnotes (notes-bibliography) or author-date |
| Basic parenthetical | (Smith, 2020) | (Smith 24) | Superscript note number¹ |
| With page (quotes) | (Smith, 2020, p. 24) | (Smith 24) | Page number in the note |
| Comma between elements | Yes | No | In the note text |
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APA 7th: Author and Year
APA citations pair the author surname and year: (Smith, 2020). Narrative forms integrate the author name directly: Smith (2020) established that… Direct quotations always append page numbers: (Smith, 2020, p. 24).
Works with two authors join surnames with an ampersand in parentheses. Three or more authors use the first author surname plus “et al.” from the initial citation onward.
MLA 9th: Author and Page
MLA replaces the year with the page number and drops the comma: (Smith 24). The narrative form reads Smith argues that… (24). When a source has no page numbers — most web pages — cite what the source offers, such as a paragraph or time marker, and when it has no author, shift to a shortened title. The full mechanics live in the MLA 9th edition formatting guide.
Chicago 17th: Notes or Author-Date
Chicago notes-bibliography systems place superscript numbers corresponding to footnotes, providing full bibliographic data on first mention and shortened citations subsequently.
The author-date variant utilizes parenthetical citations matching a reference list. Humanities disciplines favor notes, whereas social sciences use author-date documentation.
Expert Tip: Check every in-text citation against the reference list before submitting — every citation needs an entry and every entry needs a citation. Formatly’s Citation & Structure Audit™ runs exactly this check automatically.
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