The Chicago citation style is primarily used by disciplines in history and some humanities fields. The official guide is published by the University of Chicago Press:
There is also an online subscription version of the handbook, available to all SF students, faculty, and staff.
Chicago uses two versions to cite sources. You will need to know which version is required for your class or assignment. If you are unsure, ask your professor.
Author-Date citations list the date second in the citation. To refer to information within a paper, it uses in-text citations.
Notes & Bibliography citations list the title second in the citation. To refer to information within a paper, it uses footnotes and endnotes.