The False Cause is a good book and deconstructs the whole Confederate myth quite well.
If you are dealing with stupid people who do not understand the Civil War, this book helps. Quite a bit.
(BTW, I have decided so BL is being glitchy and adding books is a pain, to link to the book at an Indie bookstore. I'm using Joseph Fox here in Philly at the moment. I plan to alternate between them and Harriett's Books but their web store is down at the moment).