Always check with your professors about their preferred citation style. They may have very specific requirements, or may leave it up to you - just ask!
Chicago Manual of Style is used in the humanities, especially history.
Chicago Style (sometimes referred to as its modified form: Turabian) has two different and distinct citation styles:
The 17th edition of CMS was released in 2017 and can be found in the Reference Section of Raugust Library. (If you need to refer to the 16th edition, it's now shelved in the General Collection upstairs.)