Most of the print book collection on Islam and Christianity is located on the fifth floor of O'Neill, arranged by call numbers beginning with B, BP for Islam and BR-BX for various aspects of Christianity. They're in the northeast corner, which is the side furthest from Gasson and closest to the Boston skyline.
All scholarship builds on the work of other scholars. It's how scholars learn their disciplines. Acknowledging where your facts, ideas, and interpretations come from is a critical piece of scholarly ethics.
Four Rules for Citing Well
For the mechanics of how to work with the various styles, see our guide to citing sources.