*Beats OMB to it*

Bushido: The Warrior's Code by Inazo Nitobe
On the Warrior's Path by Daniele Bolelli
The Book of Five Rings by Miyamoto Musashi
I'd say The Art of War by Sun Tzu also, but at times that book requires so much critical thinking in order to apply it to everyday life, that it can come of as invalid in some points.

Also, be careful with these books. They may change your beliefs and have you living by a new way of life...which will cause your Christian mother to look down upon you as "practicing the wrong religion". Trust me, I know lol.

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