Bibliography

• Hatsumi, Masaaki, Ninjutsu History and Tradition. Burbank: Unique Publications Inc., 1981
• Hayes, Stephen K. Spirit of the Shadow Warrior. Santa Clarita: Ohara Publications Inc., 1980
• Bujinkan Budo Taijutsu Page. 17 May 1998
• Hjelm, Mats. Bujinkan FAQ v1.0 17 May 1998

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• Go back to Clay's paper on Ninjutsu