Good, realistic overview of violence:
http://www.amazon.com/Facing-Violence-Unexpected-Rory-Miller/dp/1594392137/ref=sr_1_1?ie=UTF8&qid=1325303541&sr=8-1
This one will help you avoid the cult-like mentality that some martial artists develop:
http://www.amazon.com/Herding-Moo-Exploits-Martial-Legend/dp/1412085144/ref=sr_1_1?s=books&ie=UTF8&qid=1325303651&sr=1-1
Historic text by Bruce Lee on Jeet Kune Do:
http://www.amazon.com/Tao-Jeet-Kune-Do-Expanded/dp/0897502027/ref=sr_1_1?s=books&ie=UTF8&qid=1325303699&sr=1-1
Gavin DeBecker's book on threat assessment:
http://www.amazon.com/Other-Survival-Signals-Protect-Violence/dp/0440508835/ref=sr_1_1?s=books&ie=UTF8&qid=1325303753&sr=1-1
Protect yourself from bad thinking:
http://www.amazon.com/Dont-Believe-Everything-You-Think/dp/1591024080/ref=sr_1_sc_1?s=books&ie=UTF8&qid=1325303844&sr=1-1-spell
Basic injury prevention/first aid for martial artists:
http://www.amazon.com/Essentials-Martial-Injury-Prevention-Second/dp/1880336898/ref=sr_1_1?s=books&ie=UTF8&qid=1325303913&sr=1-1
Good book on the theory and mechanics of the straight lead:
http://www.amazon.com/Straight-Lead-Core-Bruce-Lees/dp/0804836302/ref=sr_1_1?s=books&ie=UTF8&qid=1325303990&sr=1-1
Basic adult learning theory:
http://www.amazon.com/Adult-Learning-Basics-ASTD-Training/dp/1562865331/ref=sr_1_3?s=books&ie=UTF8&qid=1325304035&sr=1-3
Basic verbal de-escalation strategies:
http://www.amazon.com/Verbal-Judo-Gentle-Art-Persuasion/dp/0060577657/ref=sr_1_1?s=books&ie=UTF8&qid=1325304541&sr=1-1
