I can't recall a book that would be of such help to you but then, I raised my son in the dark ages. LOL I think the best way to teach them manners is just that; teach them, especially by example and never tolerate rudeness. Kids aren't perfect and neither are adults but for the most part, I needed to see that my son was trying to behave in public and just generally being polite. I stressed that he could choose the behavior but not the consequences and that seemed to do it. As a result, I received a lot of compliments about him, even when he was a toddler, and I was never embarrassed to take him anywhere. He carried that politeness through to his teenage years and, on occasion, a sales clerk or wait person would tell me how refreshing it is to see a teenager w/such good manners.

Sounds to me like you're on top of it, you're conscientious and you're endeavoring to raise a child who realizes that that other people indeed do exist. Good job.