L, I read Surviving an Affair by Willard Harley and Jennifer Chalmers. It was very informative. It talks about why A's begin and end, how to end an A, how to restore the M after an A, and how to manage resentment and rebuild trust.
I have a couple more, such as My Husband's A Was the Best Thing that Happened to Me (think that's the title). Not bad, but not as good as the first one.
There is a book that is consistently recommended here, After an Affair, I think? Perhaps someone else can verify.