The 17th edition is the most recent version of the Chicago style of writing and offers two styles of writing:
Chicago (CMS) style is commonly used style to cite sources within the fields of literature, history, the arts, and the sciences.
Use the Notes-Bibliography system for literature, history and the arts. Use the Author-date system for the sciences.
For a more detailed explanation of how to use Chicago style, see the online version of the Chicago Manual of Style.