I just finished reading the psychology chapter for the CSCS book. If you have the book, I'd recommend you read that chapter.
Otherwise, from browsing around, these books looked good:
http://www.exrx.net/Store/HK/MentalAthlete.html
http://www.exrx.net/Store/HK/Psychol...csSportEx.html
The first book is more practical, while the second is more of a textbook, but I liked all the topics that the second one covered.
They're cheaper on Amazon:
http://www.amazon.com/Mental-Athlete...3902408&sr=8-1
http://www.amazon.com/Psychological-...3907246&sr=8-1