I'm in search of any sports psychology book that boost confidence or helps someone reach their full potential. 
Relentless - Tim Grover
Bump
In 
"Don't Be Such a Pussy"
Author: your dad
The Chimp paradox by Steve Peters is supposed to be very good. Numerous Olympic Gold medalists use him as a consultant
The book of five rings.
The unfettered mind.
Hagakure.
In for good reading options
TheRealJoker - Wrestling ToughI came here to say this. My copy is all busted up from years of motivation sucked out of that book.
https://books.google.com/books/about/Wrestling_Tough.html?id=OcPia9mAlKQC
The fighters mind by that sherridan dude the marathon runners chapters were good
10 Minute Toughness was recommended to me.
http://www.amazon.com/10-Minute-Toughness-Training-Program-Winning/dp/0071600639
GSP's book is supposed to have a heavy focus on it. I haven't read it but that's what I hear.
GOATherder - http://www.amazon.com/Cum-For-Bigfoot-Volume-Books/dp/1478209828
Whoops.
I meant a book called pure sports..some cycling guy was telling me about it.
Sports Psychology for Dummies
Books by Jim Loehr.
In for later
Rhymenoceros - Two all time classics in the field are "The Inner Game of Tennis" and "With Winning in Mind."Was thinking 'inner game of tennis' myself but thought it might be a little sports specific.
True, is a classic however. I read it as a 14 year old in the early 90s and really improved my mental toughness for tennis.