Unfortunately I actually havent read any stuttering books. I only went to the therapist. I do know that the Stuttering Foundation of America has free e-books on their website. That would be a great place to start. My mom has read quite a bit of their material and has said there is a lot of good stuff in there. Past that, if you just want motivation, go to /r/getmotivated You can beat it, it can be done.