- True Path of the Ninja: The Definitive Translation of the Shoninki (The Authentic Ninja Training Manual)
- The Book of Ninja: The Bansenshukai - Japan's Premier Ninja Manual
- Modern Ninja Warfare: Ninja Tactics and Methods for the Modern Warrior
- Samurai and Ninja: The Real Story Behind the Japanese Warrior Myth that Shatters the Bushido Mystique
- Ninja Skills: The Authentic Ninja Training Manual