Complete Chicago Citation Guide (Notes-Bibliography & Author-Date)

Chicago style, developed by the University of Chicago Press, is one of the most widely used citation systems in humanities and historical research. This comprehensive guide covers both the Notes-Bibliography system (primarily for humanities) and the Author-Date system (for social sciences), providing you with everything needed to cite sources correctly and maintain academic integrity.

Understanding Chicago Citation Style

Chicago style offers two distinct systems for citing sources. The Notes-Bibliography system uses footnotes or endnotes to cite sources along with a bibliography, making it ideal for papers that emphasize narrative. The Author-Date system uses parenthetical in-text citations with a reference list, suitable for research emphasizing data and statistics.

Both systems serve the same purpose—documenting sources—but the presentation and emphasis differ. Notes-Bibliography allows authors to add commentary within notes, while Author-Date provides cleaner, less intrusive citations within the text.

Basic Citation Elements in Chicago Style

Regardless of which system you choose, Chicago style requires consistent inclusion of these elements:

• Author/Creator name (last name first in Notes-Bibliography)
• Source title (italicized for major works)
• Publication details (place, publisher, date)
• Page numbers or access information
• DOI or URL (for digital sources)

Notes-Bibliography System Overview

The Notes-Bibliography system divides citation information between footnotes/endnotes and a bibliography. This system is particularly useful when you want to provide context or additional information about your sources.

First Citation in Notes-Bibliography

When you cite a source for the first time in Notes-Bibliography, include full publication details:

1. Sarah Johnson, The Art of Academic Writing (New York: University Press, 2023), 45.
2. Michael Chen, "Modern Research Methods," Journal of Academic Studies 15, no. 3 (2022): 234-256.

Shortened Subsequent Citations

After the first citation, use shortened forms:

3. Johnson, Art of Academic Writing, 47.
4. Chen, "Modern Research Methods," 240.

Bibliography Format

All sources appear in a bibliography at the end of your paper, arranged alphabetically by author’s last name:

Johnson, Sarah. The Art of Academic Writing. New York: University Press, 2023.
Chen, Michael. "Modern Research Methods." Journal of Academic Studies 15, no. 3 (2022): 234-256.

Author-Date System Overview

The Author-Date system is more concise and places citations directly within parentheses in the text, followed by a reference list.

In-Text Citations

(Johnson 2023, 45)
(Chen 2022, 240)

Reference List Format

Sources appear alphabetically at the end:

Johnson, Sarah. 2023. The Art of Academic Writing. New York: University Press.
Chen, Michael. 2022. "Modern Research Methods." Journal of Academic Studies 15, no. 3: 234-256.

Citing Common Source Types

Books

Notes-Bibliography:

1. Author First Last, Title of Book (Place: Publisher, Year), page.

Author-Date:

(Last 2023, page)
Last, First. 2023. Title of Book. Place: Publisher.

Journal Articles

Notes-Bibliography:

1. Author First Last, "Title of Article," Journal Name volume, no. issue (Year): pages.

Author-Date:

(Last 2023, pages)
Last, First. 2023. "Title of Article." Journal Name volume, no. issue: pages.

Websites

Notes-Bibliography:

1. Author First Last, "Page Title," Website Name, accessed [date], URL.

Author-Date:

(Last [year of publication or access])
Last, First. [Year]. "Page Title." Website Name. Accessed [date]. URL.

Key Chicago Style Rules

Capitalization

Chicago style uses headline-style capitalization for titles, capitalizing the first and last words and all major words. Minor words (articles, prepositions, conjunctions) are lowercase unless they’re the first word.

Example: “The Art of Academic Writing and Research Methods”

Abbreviations

• Use “p.” or “pp.” for pages in notes
• Use “no.” for issue numbers
• Use “et al.” for multiple authors after the first in shortened citations

Punctuation and Format

• Periods go inside parenthetical citations in Author-Date
• Commas separate author name from title in Notes-Bibliography
• Titles of major works are italicized
• Titles of shorter works go in quotation marks

Handling Special Cases

Multiple Authors

Notes-Bibliography (first citation):

1. Sarah Johnson and Michael Chen, The Collaborative Research Process (New York: University Press, 2023), 89.

Author-Date:

(Johnson and Chen 2023, 89)
Johnson, Sarah, and Michael Chen. 2023. The Collaborative Research Process. New York: University Press.

No Author Listed

Notes-Bibliography:

1. "Article Title," Journal Name (Year): pages.

Author-Date:

(Anonymous [Year])
Anonymous. [Year]. "Article Title." Journal Name.

Edited Collections

Notes-Bibliography:

1. First Last, "Chapter Title," in Book Title, ed. Editor Name (Place: Publisher, Year), page.

Author-Date:

(Last 2023, page)
Last, First. 2023. "Chapter Title." In Book Title, edited by Editor Name. Place: Publisher.

Digital and Online Sources

Chicago style requires consistent treatment of digital sources. Include URLs or DOIs for online publications, along with access dates when publication dates are unavailable.

Notes-Bibliography:

1. Author First Last, "Article Title," Website Name, accessed Month Day, Year, https://example.com.

Author-Date:

(Last Year)
Last, First. Year. "Article Title." Website Name. Accessed Month Day, Year. https://example.com.

Common Mistakes to Avoid

1. Inconsistent capitalization in titles or author names
2. Mixing systems—don’t use Notes-Bibliography and Author-Date in the same paper
3. Incomplete publication details for books (missing place or publisher)
4. Forgetting to include page numbers in notes-bibliography shortened citations
5. Using outdated URLs instead of DOIs when available
6. Inconsistent punctuation between similar source types

When to Cite in Chicago Style

Cite sources when you:

• Quote directly from a source
• Paraphrase specific ideas from an author
• Reference statistics, data, or research findings
• Use another author’s unique terminology or framework
• Reference images, charts, or other visual material

General knowledge (widely known facts) typically doesn’t require citation, but if you’re uncertain, citing is safer.

Chicago Style Citation Generators

Several tools can help generate Chicago citations automatically:

• EasyBib: User-friendly interface for both systems
• CitationMachine: Supports both Notes-Bibliography and Author-Date
• Zotero: Powerful reference manager with Chicago style support
• Mendeley: Citation management with Chicago templates
• Google Scholar: Can generate Chicago citations for academic sources

Always verify auto-generated citations for accuracy, particularly with complex sources or edge cases.

Practice Examples

Example 1: Journal Article in Author-Date

In-text: (Mitchell 2024, 156)

Reference list:

Mitchell, Patricia. 2024. "Advances in Digital Archiving." Archives and Records Review 42, no. 2: 145-168.

Example 2: Book Chapter in Notes-Bibliography

Note:

1. James Robertson, "Research in the Digital Age," in Modern Academic Methods, ed. Sarah Williams (Boston: Academic Press, 2023), 234.

Bibliography:

Robertson, James. "Research in the Digital Age." In Modern Academic Methods, edited by Sarah Williams, 225-245. Boston: Academic Press, 2023.

Example 3: Website in Author-Date

In-text: (National Archive 2024)

Reference list:

National Archive. 2024. "Digitized Historical Documents." Accessed March 16, 2026. https://www.nationalarchive.org/documents.

Moving Forward with Chicago Style

Mastering Chicago citation takes practice, but the detailed nature of the style reflects its strength—it provides clear documentation of sources for scholarly audiences. Whether you’re writing a history paper using Notes-Bibliography or a social science research report using Author-Date, understanding Chicago’s principles ensures your work meets academic standards.

For detailed guidance on specific source types, explore our dedicated guides on citing journal articles, books, websites, and other materials in Chicago style. Use our citation generator tools to streamline your citation process while maintaining accuracy.

Remember that consistency is key—choose your system, apply it throughout your work, and your citations will serve their purpose: building trust with your readers by acknowledging your sources and enabling them to verify your research.