Learning how to do chicago in text citations is simpler than it first appears, once you know that Chicago style actually offers two different systems and that “in text” means something slightly different in each of them. Many students arrive at Chicago style after using other systems, and they expect a single rule for citing inside the body of an essay. Chicago, published by the University of Chicago, instead gives writers a choice: the notes and bibliography system, which uses footnotes or endnotes, and the author-date system, which uses brief parenthetical citations in the text itself. This guide explains both, shows you exactly how to format citations in each system, and helps you decide which one your assignment or publisher expects.
The distinction matters because using the wrong system is the most common Chicago mistake. If your tutor, journal, or publisher asks for Chicago style without specifying further, check their guidance, a sample paper, or a style sheet before you start writing. Humanities subjects such as history, literature, and the arts usually use notes and bibliography, where the “in text” marker is a small superscript number leading to a full note. Social sciences and natural sciences usually use author-date, where the citation sits in parentheses right in the sentence. Both systems are fully Chicago, and both are correct, but they are not interchangeable within a single paper. Pick one, and use it consistently from the first citation to the bibliography.
How to Do Chicago in Text Citations: An Overview
When people ask how to do chicago in text citations, they usually mean one of two things: how to place a short citation inside a sentence, or how to handle the numbered note that a Chicago citation points to. In the author-date system, the in-text citation is a parenthetical note containing the author’s surname, the year of publication, and, where relevant, a page number, for example (Smith 2020, 45). The reader can then find the full reference in the reference list at the end, organised alphabetically by author. In the notes and bibliography system, the in-text element is a superscript number placed at the end of the clause or sentence, such as a claim about the period.ยน The full details appear in a footnote at the bottom of the page or in an endnote, and the bibliography at the end lists all sources alphabetically.
Both systems share the same underlying purpose: to show exactly where an idea, quotation, or piece of evidence came from, so a reader can check it. A citation is not decoration, and it is not only for direct quotations. Paraphrased ideas, statistics, and distinctive arguments all need citation, because the reader needs to know which parts of your writing are your own analysis and which parts rest on someone else’s work. Good citation practice is also a defence against plagiarism: it draws a clear line between your voice and your sources, and it gives credit where credit is due.
A further shared rule is consistency of detail. Whichever system you use, give enough information for the reader to find the source without guessing. That means author names spelled as they appear on the source, publication years checked against the title page rather than memory, and page numbers included for specific claims and quotations. Small errors in these details cause real frustration for readers trying to follow up a reference, so treat the checking of names, dates, and pages as part of writing, not as an afterthought to be rushed at the end.
How to Do Chicago in Text Citations in Author-Date Style
In author-date style, the basic in-text citation has three parts: author, year, and page, where a page is relevant. A parenthetical citation looks like this: (Johnson 2019, 112). A narrative citation, where the author’s name is part of your sentence, looks like this: Johnson (2019, 112) argues that the policy failed. Both forms give the same information; the choice depends on sentence flow. If you mention the author in the sentence, do not repeat the name in the parentheses. If you do not mention the author, put the full citation in parentheses at the end of the clause, before the final punctuation.
Works with two authors name both authors, joined by “and” in narrative citations and by “and” in parenthetical citations as well, since Chicago author-date uses “and” rather than an ampersand: (Lee and Patel 2021, 78). Works with three or more authors use the first author’s surname followed by “et al.” in the text: (Garcia et al. 2022, 31). The full reference list entry, however, names all authors up to a limit set by the style guide, so the shortened text citation never replaces the complete entry at the end. For a work with no named author, use a shortened title in place of the author name, for example (A History of the River Valley 2018, 56).
Page numbers deserve care. Include a page number whenever you quote directly or refer to a specific passage, and use the page range for a discussion spread across pages, for example (Smith 2020, 45-47). For sources without page numbers, such as many web pages, cite a chapter, section heading, or paragraph number if one is available and helpful. When you cite the same source twice in a row, Chicago author-date simply repeats the short citation; unlike the notes system, it does not use shortened Latin terms for repetition. If you cite two works by the same author in the same year, add a letter to the year, such as (Smith 2020a) and (Smith 2020b), and match those letters in the reference list.
Author-date examples for common source types
Book: (Thompson 2017, 203). Chapter in an edited book: (Nguyen 2021, 88-90), where the reference list entry will name the editor and the book. Journal article: (Okafor 2023, 14). Website: (National Museum of History 2024), with a paragraph or section reference added if the passage needs pinpointing. In every case, the reference list entry carries the full publication details: author, year, title, place of publication and publisher for books, or journal title, volume, and page range for articles. The in-text citation is a pointer; the reference list is the destination.
How to Do Chicago in Text Citations in Notes and Bibliography
In the notes and bibliography system, your text carries a superscript number, and the citation lives in the note. Place the number at the end of the sentence or clause to which it applies, after the punctuation in most cases, following Chicago convention. The first time you cite a source, the note gives the full details: author, title, publication information, and page, for example in a footnote for a book: John Smith, The River Valley in the Nineteenth Century (Chicago: University of Chicago Press, 2020), 45. Later citations of the same source use a shortened note: Smith, River Valley, 78. The bibliography entry at the end then gives the full details in a slightly different arrangement, with the author’s surname first.
Shortened notes are where many students save time once they learn the pattern. After the first full note, you need only the author’s surname, a shortened title of four words or fewer, and the page number. If you cite the same source in consecutive notes, Chicago now prefers the shortened form repeated, rather than the older Latin term for “in the same place”. Keep the shortened title consistent, and make sure it is recognisable: use the first distinctive words of the title, not a generic word such as “History” alone. For a source with no author, the shortened note begins with the shortened title.
Quotations in the notes system follow the same principle as in author-date: cite the page where the quoted words appear, and place the note number so the reader can see exactly which claim it supports. If a single sentence contains material from two sources, use two note numbers, one for each claim, placed so each number follows the material it supports. Long quotations, set off as block quotations, still need a note, placed after the final punctuation of the quotation. The note system is flexible, and that flexibility is its strength, but it also means placement matters: a note number in the wrong spot can make it unclear which statement is sourced.
| Feature | Author-date system | Notes and bibliography system |
|---|---|---|
| Marker in the text | Parenthetical citation, for example (Smith 2020, 45) | Superscript number leading to a footnote or endnote |
| Full details location | Reference list at the end | First footnote or endnote, plus bibliography |
| Repeated citations | Repeat the short parenthetical citation | Use a shortened note with surname, short title, page |
| Typical subjects | Social sciences and natural sciences | History, literature, and the arts |
Common Mistakes in Chicago in Text Citations
Mixing the two systems is the most frequent error, and it usually happens when a writer copies examples from different guides without noticing which system each example belongs to. A paper that uses parenthetical author-date citations in one chapter and footnotes in the next will confuse readers and markers alike. Decide on your system before drafting, and check a sample paper in that system so your eye learns its shape. If your assignment specifies one system, that specification overrides any general preference.
Missing page numbers are the second common problem. A citation without a page number is acceptable for a general reference to a whole work, but not for a quotation or a specific claim. Readers should be able to open the source and find the passage quickly. Similarly, inconsistent author names cause trouble: use the name as it appears on the source, keep the spelling identical across text, notes, and bibliography, and do not switch between a full first name and initials without reason. Small inconsistencies accumulate into an impression of carelessness, even when the underlying research is strong.
A third mistake is over-citing or under-citing. Every distinctive idea from a source needs a citation, but your own analysis, your own synthesis of several sources, and common knowledge do not need a citation for every sentence. The test is whether a reader could reasonably ask “whose idea is this, and where can I check it?” If the answer is a source, cite it. If the answer is your own argument built on cited evidence, the citations supporting the evidence are enough. When in doubt, cite: an extra citation rarely harms a paper, while a missing one can undermine its credibility.
For related reading on this site, see a guide to in-text citations with two authors, a guide to in-text citations for appendices, and a writing guide with practical tips. Those pages cover neighbouring citation and writing topics in general educational terms, and comparing Chicago with other systems often makes Chicago’s own logic clearer.
Chicago in Text Citations FAQs
Which Chicago system should I use?
Use the system your tutor, journal, or publisher specifies. Humanities subjects usually use notes and bibliography, while social and natural sciences usually use author-date. If no system is specified, ask before you start.
Do I need a page number in every Chicago in-text citation?
Include a page number for direct quotations and specific claims. For a general reference to a whole work, a citation without a page number is acceptable.
How do I cite a source with three or more authors in author-date style?
In the text, use the first author’s surname followed by “et al.”, for example (Garcia et al. 2022, 31). The reference list entry gives the full author details.
What is a shortened note in Chicago style?
A shortened note is the brief form used after the first full citation in the notes system: author’s surname, a shortened title, and the page number, for example Smith, River Valley, 78.
Conclusion
Knowing how to do chicago in text citations comes down to knowing which of the two Chicago systems you are using and applying it consistently. In author-date style, place a brief parenthetical citation with author, year, and page in the sentence itself, and give full details in the reference list. In notes and bibliography style, place a superscript number in the text and give full details in the first note, shortened notes afterwards, and the bibliography. Cite quotations and specific claims with page numbers, keep author names consistent, and never mix the two systems in one paper. Master those habits, and Chicago citations stop being a source of anxiety and become what they are meant to be: a clear, reliable trail from your argument back to the evidence that supports it.
