Mastering Chicago Style: A Comprehensive Guide to Citing Sources
Citing sources accurately and consistently is a crucial aspect of academic writing. The Chicago Manual of Style (CMOS), a widely-used style guide, provides clear and detailed guidelines for in-text citations and reference lists. This guide will walk you through the process of citing sources in Chicago style, focusing on the two most common systems: Notes and Bibliography (NB) and Author-Date.
Understanding the Two Systems: Notes and Bibliography vs. Author-Date
Before delving into the citation process, it's essential to understand the two main systems in Chicago style:
- Notes and Bibliography (NB): This system is often used in humanities disciplines. It involves using footnotes or endnotes for in-text citations and a separate bibliography for the full references.
- Author-Date: This system is commonly used in social sciences. It uses parenthetical in-text citations that include the author's last name and the publication date, and a reference list at the end of the paper.
Choose the system that best fits your discipline's guidelines or your instructor's preferences.

Citing Sources in Notes and Bibliography (NB) System
In-Text Citations
In the NB system, in-text citations are placed at the end of a sentence or within parentheses. They should correspond to the note number in your notes section. Here are some examples:
- According to Smith (note 1),...
- ...as Smith argues (see note 1).
Notes
Notes should be numbered consecutively throughout your paper. Here's how to format different types of sources:
- Book: 1. Author's Last Name, Title of the Book, publication details (place of publication: publisher, year).
- Article: 2. Author's Last Name, "Title of the Article," Journal Title volume, issue (year): page range.
Bibliography
The bibliography should include all the sources cited in your paper. It should be alphabetized by author's last name and formatted as follows:

- Book: Author's Last Name, First Name. Title of the Book. Place of publication: publisher, year.
- Article: Author's Last Name, First Name. "Title of the Article." Journal Title volume, issue (year): page range.
Citing Sources in Author-Date System
In-Text Citations
In the Author-Date system, in-text citations are placed within parentheses at the end of a sentence. They should include the author's last name and the publication date. Here are some examples:
- According to Smith (2020),...
- ...as Smith (2020) argues.
Reference List
The reference list should include all the sources cited in your paper. It should be alphabetized by author's last name and formatted as follows:
| Type of Source | Format |
|---|---|
| Book | Author's Last Name, First Name. Title of the Book. Place of publication: publisher, year. |
| Article | Author's Last Name, First Name. "Title of the Article." Journal Title volume, issue (year): page range. |
Commonly Cited Sources
Certain types of sources, such as websites, personal communications, and government documents, have specific citation formats. Always consult the CMOS for the most accurate and up-to-date guidelines.
Citing sources in Chicago style may seem daunting at first, but with practice and careful attention to detail, you'll become proficient in this essential academic skill. Always remember to maintain consistency in your citations and to follow your discipline's or instructor's specific guidelines.