I'd say The Straight Lead by Teri Tom (even if you don't use it, it gives a GREAT feel for body mechanics in general), Commentaries On The Martial Way by Bruce Lee, Go Rin No Sho by Miyamoto Musashi, The Art of War by Sun Tzu, and maybe pick up a book on keeping a stance.
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Scientific Street Fighter|Weapon of Choice = Combat Boots|Tool of Choice = Elbows