Chicago Style citations are available in two systems: notes and bibliography, and author-date.
The Notes and bibliography system is common in the humanities including history, literature and the arts. Sources are cited in numbered footnotes, and often listed in a bibliography.
The Author-date system is more common in the social sciences and sciences. Sources are cited in the text, within parentheses, by author’s last name and year of publication. All in-text citations are listed with full information in a bibliography.
Get started by looking at the Chicago-Style Quick Guide.
Not sure of which system to use? Ask your teacher, supervisor, or check with the publisher and instructions for authors.