A Bundle of Sticks by Pat Mauser McCord
It's a children's book, but it has a lot of good lessons and centers around the protagonist's Kajukenbo training. (I actually found it before training in Kajukenbo, but now I give it as "required" reading.)
Lots of good answers and a great list to start a martial arts library!
I have read a lot of very good martial arts books but the one I have enjoyed the most above them all is Angry White Pyjamas Its just a great read.
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