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What is Chicago Author-Date Style?
The Chicago Manual of Style (CMOS) offers two citation systems: Notes-Bibliography and Author-Date. The Author-Date system is the preferred format in the natural and social sciences. It uses parenthetical in-text citations containing the author's surname and the year of publication, directing readers to a reference list at the end of the paper.
This style balances readability with precision, making it easy for readers to identify sources without interrupting the flow of the text. It is widely used in disciplines like sociology, anthropology, economics, political science, and environmental studies.
Chicago Author-Date In-Text Citation Basics
In-text citations in Chicago Author-Date style are enclosed in parentheses and include the author's last name and the year of publication. Unlike APA style, there is no comma between the author name and the year.
Basic Format:
(Author Year)
Examples:
- One author: (Smith 2024)
- Two authors: (Smith and Johnson 2024)
- Three authors: (Smith, Johnson, and Williams 2024)
- Four+ authors: (Smith et al. 2024)
- Direct quote: (Smith 2024, 45)
Note that Chicago Author-Date does not use a comma between the author and year (unlike APA). When citing a specific page, add a comma after the year followed by the page number. For multiple works by the same author in the same year, use letters: (Smith 2024a, 2024b).
Chicago Author-Date Reference List
The reference list appears at the end of the paper and includes all sources cited in the text. References are arranged alphabetically by the author's last name. If multiple works by the same author exist, they are ordered chronologically from oldest to newest.
Key Formatting Rules:
- Arrange entries alphabetically by author's last name
- The year follows the author name, preceded by a period
- Use headline-style capitalization for titles of books and journals
- Use sentence-style capitalization for article titles
- Use hanging indentation (first line flush left, subsequent lines indented)
- Include DOI if available; otherwise include the URL
Common Source Examples:
Journal Article:
Smith, John, and Mary Johnson. 2024. "Article Title in Sentence Case." Journal Name 15 (3): 45–67. https://doi.org/10.1234/example.
Book:
Smith, John. 2024. Book Title in Headline Style. Chicago: University of Chicago Press.
Website:
Smith, John. 2024. "Article Title." Website Name. https://www.example.com.
Common Chicago Author-Date Mistakes to Avoid
Chicago Author-Date has several nuanced rules that can trip up even experienced writers. Here are the most common mistakes and how to avoid them:
Adding a Comma Between Author and Year
Unlike APA, Chicago Author-Date does not use a comma between the author and year. Write (Smith 2024), not (Smith, 2024). This is one of the most common mistakes when switching from APA format.
Confusing Author-Date with Notes-Bibliography
Chicago has two distinct systems. Author-Date uses parenthetical citations and a reference list, while Notes-Bibliography uses footnotes/endnotes and a bibliography. Make sure you're using the correct system for your discipline.
Wrong Capitalization Style
Chicago uses headline-style capitalization for book titles and journal names (capitalize all major words), but article and chapter titles should use sentence case in the reference list. In-text titles follow headline style.
Handling Same-Author, Same-Year Works
When citing multiple works by the same author published in the same year, add lowercase letters to the year: 2024a, 2024b, etc. These letters should also appear in the reference list entries, and works are ordered by title.
Using "and" vs. "&" for Multiple Authors
Chicago Author-Date uses "and" (not "&") between author names in both in-text citations and the reference list. This differs from APA, which uses "&" in parenthetical citations and reference entries.
Source-Specific Citation Guides
Need detailed guidance on how to cite a specific source type in Chicago Author-Date format? Our comprehensive guides walk you through each citation format with real examples:
Frequently Asked Questions
When should I use Chicago Author-Date vs. Notes-Bibliography?
Use Author-Date for sciences and social sciences (sociology, anthropology, economics, political science, environmental studies). Use Notes-Bibliography for humanities (literature, history, arts, philosophy). When in doubt, check your professor's or journal's style requirements.
How is Chicago Author-Date different from APA?
The main differences are: Chicago uses no comma between author and year (Smith 2024 vs. Smith, 2024), Chicago uses "and" instead of "&" for multiple authors, Chicago reference lists place the year after the author name with a period, and capitalization rules differ for titles.
How do I cite a source with no author?
If no author is available, use the title of the work in place of the author name. In in-text citations, use a shortened version of the title. For the reference list, begin the entry with the title and alphabetize it by the first significant word.
Do I need to include access dates for online sources?
Chicago generally does not require access dates for formally published online sources. However, if the content is likely to change (such as wiki pages or social media posts), include the access date. Always include the full URL or DOI. Your instructor may have specific requirements about access dates.
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