When choosing which database to use, keep in mind the multidisciplinary nature of your topic, and select databases accordingly. You may want to visit other discipline specific research guides for database recommendations... or talk with a librarian!
Your professor will accept any properly formatted citations, but prefers Chicago's Author/Date style.
You can find all of the major citation styles on the Citation Guide, as well as Citation Managers.
If you're not sure how to cite something properly, just stop by the Research Help Desk on the main floor, ask via online chat, or send an email to firstname.lastname@example.org. It can get confusing; we're happy to help!