No matter the style—APA, MLA, Chicago—the goal is the same: help your reader find the exact source without agony. That’s it. The rules are just training wheels for that goal.
So if you ever feel lost, ask yourself: Does this citation make it easier or harder for someone to grab the book? If it’s harder, you’re probably off track.
And remember: it’s okay to double-check. Every writer does. Even the pros keep a style guide tab open because—let’s be real—nobody memorizes every comma.