The most common citation style for Religious Studies is MLA.
The most recent edition of The MLA Handbook is the ninth edition (published in 2021).
The most recent edition of The Chicago Manual of Style (18th edition) is available in our libraries as an ebook. Please note that the Chicago Manual uses two styles of citation: "Notes and Bibliography" and "Author-Date" format. It's always a good idea to check with your professor which format they prefer.
