The Book of Family Traditions on the Art of War

I have to add that people should also read The Book of Five Rings that was written by Musashi. I can't count the number of times I have bought and given away this book. Especially the translation done by Thomas Cleary. Cleary adds another text into the mix "The Book of Family Traditions on the Art of War" by Yagyu Munenori, a contemporary of Musashi, but from a very different circle, so you get a nice contrast, and I believe it shows you how simplicity wins(5 rings). But both are excellent reads.