- The Book of Ninja: The Bansenshukai - Japan's Premier Ninja Manual
- True Path of the Ninja: The Definitive Translation of the Shoninki (The Authentic Ninja Training Manual)
- How To Be a Modern Samurai: 10 Steps To Finding Your Power & Achieving Success
- Modern Ninja Warfare: Ninja Tactics for the Modern Warrior
- Samurai and Ninja: The Real Story Behind the Japanese Warrior Myth that Shatters the Bushido Mystique