I'm guessing these are non wresltling realted books so in addition to those already mentioned..
Steve Claridge's autobiography
Play.com (UK) : Tales from the Boot Camps : Books - Free Delivery
and
Vinnie Jones' autobiography
Play.com (UK) : Vinnie: The Autobiography : Books - Free Delivery
They're both a little out of date now but they're both worth a read. Down to earth characters being honest about everything from anger issues, gambling & alcohol addiction. Simlar to Gazza's in that respect