Editing and The Chicago Manual of Style

I have a copy of The Chicago Manual of Style, so that's the one I'm using.  The SBL manual might be more useful for a theology paper, but I don't have a copy.

In any case, the possible ways of referring to books cited in the text are so complicated that I despair of mastering them.  Today I changed, for about the third time, the way of citing a chapter that has an author different from the author or editor/s of the book in which it occurs.  Navigating The Chicago Manual surely competes in complexity with navigating the city itself.