How Do You Know Which Chicago Style to Use?
Chicago-style source citations come in two types:
►notes and bibliography
To determine which system to follow the best first step is to check with your professor. However, there are some general rules of thumb.
From the Chicago Manual of Style website:
"The notes and bibliography system is preferred by many working in the humanities—including literature, history, and the arts. In this system, sources are cited in numbered footnotes or endnotes. Each note corresponds to a raised (superscript) number in the text. Sources are also usually listed in a separate bibliography. The notes and bibliography system can accommodate a wide variety of sources, including unusual ones that don’t fit neatly into the author-date system.
The author-date system is more common in the sciences and social sciences. In this system, sources are briefly cited in the text, usually in parentheses, by author’s last name and year of publication. Each in-text citation matches up with an entry in a reference list, where full bibliographic information is provided."
The information which follows comes from The Chicago Manual of Style website.