Illustrated Ninja Handbook: Hidden Techniques of Ninjutsu

Sogobujutsu: Psychology, Philosophy, Tradition

Ninja Defense: A Modern Master's Approach to Universal Dangers (Downloadable Media Included)

Ninja and Their Secret Fighting Art

Ninja: Ancient Shadow Warriors of Japan (The Secret History of Ninjutsu)

More Secrets of the Ninja: Their Training, Tools and Techniques

Ninja Tools and Weapons

Ninja Mind: Harnessing the Mental Strength and Physical Abilities of the Ninjutsu Masters

The Secret Traditions of the Shinobi: Hattori Hanzo's Shinobi Hiden and Other Ninja Scrolls

True Path of the Ninja: The Definitive Translation of the Shoninki (An Authentic Ninja Training Manual)

Shoninki: The Secret Teachings of the Ninja: The 17th-Century Manual on the Art of Concealment

Ninja Weapons: Chain and Shuriken

Aiki-Jujutsu: Mixed Martial Art of the Samurai

The Spiritual Practices of the Ninja: Mastering the Four Gates to Freedom

Art of Life and Death: Lessons in Budo From a Ninja Master

Japan's Complete Fighting System Shin Kage Ryu

Mind Warrior:: Strategies for Total Mind Domination

Ninja Fighting Techniques: A Modern Master's Approach to Self-Defense and Avoiding Conflict

The Secret Art of Pressure Point Fighting: Techniques to Disable Anyone in Seconds Using Minimal Force

The Book of Ninja: The Bansenshukai - Japan's Premier Ninja Manual