The Chicago Manual of Style presents two basic documentation systems: the Humanities style (notes and bibliography) and the Author-Date system. Choosing between the two often depends on the subject matter, and the nature of the sources cited, as different groups of scholars favor each system.
The Humanities style is preferred by many in literature, history, and the arts. This style presents bibliographic information in notes and, often, a bibliography. It accommodates a variety of sources, including esoteric ones less appropriate to the author-date system.
The more concise Author-Date system has long been used by those in the physical, natural, and social sciences. In this system, sources are briefly cited in the text, usually in parentheses, by author’s last name and date of publication. The short citations are amplified in a list of references, where full bibliographic information is provided.
The two dropdown pages provide common examples of materials cited in both styles. For numerous specific examples, see chapters 16 and 17 of The Chicago Manual of Style, 15th edition.
Online sources that are analogous to print sources (such as articles published in online journals, magazines, or newspapers) should be cited similarly to their print counterparts but with the addition of a URL. Some publishers or disciplines may also require an access date. For online or other electronic sources that do not have a direct print counterpart (such as an institutional Web site or a Weblog), give as much information as you can in addition to the URL.
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The notes and bibliography style |
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The author-date style
| Author/Date Style | In-Text Citation | Bibliography |
| A Book |
(Kenneth 2002, 56-58) |
Kenneth, Timothy. 2002. Valuing Environmental and Natural Resources: The Econometrics of Non-Market Valuation. Cheltenham, U.K: E. Elgar Pub. |
| An article in a print journal | (Byron 2011, 1353) | Byron, William K. 2011. "Adaptive Management of Natural Resources—Framework and Issues," Journal of environmental management 92.5:1346-1353. |
| An article in an electronic journal | (Shawn and William 2020, 172) | Shawn, Dagusta H and Ascher, William. 2020. "Natural resources and conflict: A meta-analysis of the empirical literature, Ecological Economics, no. 3:172, accessed July 24, 2024, https://doi.org/10.1016/j.ecolecon.2020.106633. |
| A website | (Google 2010) |
Google. 2010. “Google Privacy Policy.” Last modified May 15. http://www.google.com/intl/en/privacypolicy.html. |
Additional information on Chicago/Turabian style may be found at these websites: