Players
Recommended reading and documentaries
Mind Gym
Gary Mack & David Gasstevens
http://www.amazon.com/Mind-Gym-Athletes-Guide-Excellence/dp/0071395970The Mental ABC's of Pitching
Heads-Up Baseball
Playing the Game One Pitch at a Time
http://www.amazon.com/Heads-Up-Baseball-Playing-Game-Pitch/dp/1570280215