Chicago style is from the University of Chicago.
Turabian style is based on Chicago style and was created to simplify it.
There are two distinct methods (or systems) for citing sources in Chicago/Turabian style. Be sure to use the one your professor prefers.
1. Notes and Bibliography Style (also known as just Notes or Bibliographic or NB style):
This style is typically used for literature, history, and the arts. Sources are cited within your paper using footnotes and all sources are listed in a Bibliography at the end of your paper.
2. Author-Date Style:
This style is typically used for natural, physical, and social sciences. Sources are cited in the text of your paper, with the author's last name and date of publication in parentheses, and all sources used are listed in a Reference List at the end of the paper. (This style resembles the APA style.)