I've gotten something of value out of every tennis book I've read. For the mental game, books by former Wimbledon top ten player and famed Pepperdine coach, Dr. Allen Fox are great.
Two books I'm currently reading in the hot-tub, slowly, this year are the new book by Marcus P. Cootsona, philosophically titled, "OCCAM'S RACQUET" and the old book by Tilden "SPIN OF THE BALL".
Good books to have in a player's medicine cabinet to help keep them on the courts and to ward-off the nagging injuries tennis players are susceptible to is any book by famed NYU "back doctor" Dr. John E. Sarno, MD. I'm currently reading a new book by one of the Good Doctor's disciples, Steven Ray Ozanich, that's a text book for overcoming chronic pain, is "THE GREAT PAIN DECEPTION: Faulty Medical Advice is Making US Worse".
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox