The Chicago Style consists of two different systems:
- the first one, for humanities, is often used in history. Bibliographic citations are provided in notes (footnotes or endnotes), with or without a full bibliography at the end of the text.
- The second system, the author-date system, is used in social sciences. Sources are cited in the text, usually in parentheses, by the author’s last name, the publication date of the work cited, and a page number if needed. Full details appear in the bibliography - usually titled « References » or « Works Cited » - in which the year of publication appears immediately after the author’s name.