What Is Chicago Format Citation? Easy Guide

The Chicago format citation is a widely used citation style that provides authors with a comprehensive system for referencing their sources. Developed by the University of Chicago, this style is commonly used in history, philosophy, and social sciences. The Chicago format citation style offers two main documentation systems: the author-date system and the notes-bibliography system. In this article, we will delve into the world of Chicago format citation, exploring its basics, applications, and providing a step-by-step guide on how to use it effectively.
Introduction to Chicago Format Citation

The Chicago format citation style is designed to help authors and researchers accurately credit the sources they use in their work. This style is particularly useful for authors who need to cite a wide range of sources, from books and articles to interviews and online resources. The Chicago Manual of Style, which is the official guide to the Chicago format citation style, provides detailed guidelines on how to format citations, references, and bibliographies.
Author-Date System vs. Notes-Bibliography System
The Chicago format citation style offers two distinct systems for documenting sources: the author-date system and the notes-bibliography system. The author-date system is commonly used in social sciences and is characterized by the use of parentheses to enclose the author’s last name and the year of publication. The notes-bibliography system, on the other hand, is commonly used in history, philosophy, and arts, and is characterized by the use of footnotes or endnotes to cite sources.
The author-date system is often preferred in fields where the date of publication is crucial, such as in scientific research. In contrast, the notes-bibliography system is often preferred in fields where the context and analysis of sources are more important, such as in historical research. Authors should carefully consider the requirements of their field and the preferences of their publisher or instructor when choosing between these two systems.
Formatting Citations in the Author-Date System
In the author-date system, citations are formatted with the author’s last name and the year of publication in parentheses. For example: (Smith 2020). If the citation includes a page number, it is separated from the year by a comma: (Smith 2020, 23). Citations with multiple authors are formatted with the authors’ last names separated by commas: (Smith, Johnson, and Williams 2020).
Citation Type | Example |
---|---|
Single author | (Smith 2020) |
Multiple authors | (Smith, Johnson, and Williams 2020) |
Page numbers | (Smith 2020, 23) |

Formatting Citations in the Notes-Bibliography System
In the notes-bibliography system, citations are formatted as footnotes or endnotes, with a corresponding bibliography entry. Footnotes are numbered consecutively throughout the text, and the corresponding bibliography entry includes the author’s full name, title of the work, and publication information. For example:
1. John Smith, The History of Chicago (Chicago: University of Chicago Press, 2020), 23.
The bibliography entry would include the same information, formatted as follows:
Smith, John. The History of Chicago. Chicago: University of Chicago Press, 2020.
Chicago Format Citation Examples

The Chicago format citation style provides a wide range of examples for citing different types of sources, including books, articles, interviews, and online resources. Here are a few examples:
Book: Smith, John. The History of Chicago. Chicago: University of Chicago Press, 2020.
Article: Johnson, Mary. "The Impact of Climate Change on Urban Planning." Journal of Urban Planning 100, no. 2 (2020): 23-35.
Interview: Williams, David. Interview by author, January 10, 2020.
Common Challenges in Chicago Format Citation
One of the most common challenges in using the Chicago format citation style is ensuring consistency throughout the work. Authors should carefully review their citations and bibliography entries to ensure that they are formatted correctly and consistently. Another challenge is citing sources with multiple authors or editors, which can be complex and require careful attention to detail.
In addition, authors may encounter challenges when citing online sources, such as websites or social media posts. These sources often lack traditional publication information, such as page numbers or authors' names, which can make it difficult to format citations correctly. However, the Chicago Manual of Style provides guidelines for citing these types of sources, and authors can consult online resources and style guides for additional guidance.
Best Practices for Chicago Format Citation
To ensure accurate and consistent citation formatting, authors should follow best practices for Chicago format citation. These include:
- Consulting the Chicago Manual of Style and other reliable resources for guidance on citation formatting
- Using citation management tools, such as Zotero or EndNote, to help format citations and bibliography entries
- Carefully reviewing citations and bibliography entries for consistency and accuracy
- Seeking guidance from instructors or editors if unsure about citation formatting
What is the main difference between the author-date system and the notes-bibliography system in Chicago format citation?
+The main difference between the author-date system and the notes-bibliography system is the way citations are formatted. The author-date system uses parentheses to enclose the author’s last name and the year of publication, while the notes-bibliography system uses footnotes or endnotes to cite sources.
How do I format a citation for a book with multiple authors in the Chicago format citation style?
+To format a citation for a book with multiple authors, list the authors’ names in the order they appear on the title page, separated by commas. For example: Smith, John, Jane Johnson, and Bob Williams. The History of Chicago. Chicago: University of Chicago Press, 2020.
What is the purpose of the bibliography in the Chicago format citation style?
+The bibliography is a list of all sources cited in the work, formatted according to the Chicago Manual of Style. Its purpose is to provide readers with a comprehensive list of sources used in the research, allowing them to locate and consult the sources themselves.