Chicago author-date style: a complete guide
Chicago author-date is the parenthetical alternative to Chicago notes-bibliography — same publication manual, very different look on the page. It is the default in many social-science journals and increasingly common in interdisciplinary work. Our Chicago citation generator handles author-date references just as cleanly as the notes form.
What is Chicago author-date style?
Chicago author-date is the parenthetical sibling of Chicago notes-bibliography. Both systems are defined by the same Chicago Manual of Style (17th edition), but author-date uses parenthetical references in the text and a reference list at the end — closer in shape to APA than to traditional Chicago footnotes.
Author-date is the default in many social-science fields that publish to Chicago — sociology, anthropology, political science, and certain economics journals. It is also widely accepted in the natural sciences when a journal does not specify a different format.
In-text citations
Place the author's last name and the publication year in parentheses, with no comma between them, immediately before the closing punctuation.
Local elections produce more variable turnout than presidential ones (Hajnal and Trounstine 2014).
She defines neighborhood effects as "the spatial concentration of advantage and disadvantage" (Sampson 2012, 31).
Multiple authors
List up to three authors. For four or more, use the first author's name followed by et al. from the very first citation.
(Verba, Schlozman, and Brady 1995)
(Putnam et al. 2003)
Reference list
The reference list appears at the end of the document under the heading References, alphabetized by author surname. Entries use hanging indents and place the year directly after the author — the visual cue that flags this as the author-date variant rather than NB.
Sampson, Robert J. 2012. Great American City: Chicago and the Enduring Neighborhood Effect. Chicago: University of Chicago Press.
Hajnal, Zoltan, and Jessica Trounstine. 2014. "Race and Class Inequality in Local Politics." American Political Science Review 108, no. 1: 19–37. https://doi.org/10.1017/S0003055413000567.
Books and book chapters
Whole book
Verba, Sidney, Kay Lehman Schlozman, and Henry E. Brady. 1995. Voice and Equality: Civic Voluntarism in American Politics. Cambridge, MA: Harvard University Press.
Chapter in an edited book
Mansbridge, Jane. 2005. "Cracking through Hegemonic Ideology: The Logic of Formal Justice." In Justice and Democracy, edited by Keith Dowding, Robert Goodin, and Carole Pateman, 89–110. Cambridge: Cambridge University Press.
Websites and blog posts
Web sources include the author (or organization), year, page title in quotation marks, site name, date posted, and URL. Add a retrieval date only when the page lacks a posted date or is likely to change.
Pew Research Center. 2023. "Trust in Government: 1958–2023." September 19, 2023. https://www.pewresearch.org/politics/2023/09/19/.
Drum, Kevin. 2022. "Why Inflation Eased Faster Than Forecast." Mother Jones (blog). November 11, 2022. https://www.motherjones.com/.
Author-date vs. notes-bibliography
Both systems carry the same bibliographic detail; only the punctuation, ordering, and citation marker differ. The table below summarizes the key differences for the same hypothetical journal article.
| Element | Notes-Bibliography | Author-Date |
|---|---|---|
| In-text marker | Superscript note number1 | (Author Year, page) |
| Year placement | After publisher in parentheses | Directly after author |
| Element separators | Periods (bibliography), commas (notes) | Periods throughout |
| List heading | Bibliography | References |
| Discursive notes | Embedded in citation footnotes | Use separate explanatory notes |
| Best for | History, humanities | Social sciences, natural sciences |
Common mistakes
Adding a comma between author and year
Chicago author-date does not place a comma between the author and year inside parentheses: (Sampson 2012), not (Sampson, 2012). The comma rule is APA — Chicago drops it.
Forgetting the comma before the page number
Page numbers are separated from the year by a comma: (Sampson 2012, 31). So: no comma after the author, but yes comma before the page.
Inverting names in the reference list incorrectly
In Chicago author-date, only the first author's name is inverted (Last, First). Co-authors appear in normal order: Verba, Sidney, Kay Lehman Schlozman, and Henry E. Brady.
Quick summary
| Feature | Chicago author-date rule |
|---|---|
| In-text format | (Author Year, page) |
| No comma | Between author and year |
| Comma | Between year and page |
| 4+ authors | First author + et al. from first citation |
| List heading | References |
| Year placement | Right after the author's name |
| Title format | Books italicized; articles in quotes |
| DOI | Full URL form, no trailing period |
Need a Chicago author-date reference fast? Our free Chicago citation generator turns any DOI, URL, or ISBN into a correctly formatted entry — for the author-date and notes-bibliography forms.
Try the Chicago Citation Generator