Incoming Resources
- The ninja defense, a modern master's approach to universal dangers, Stephen K. Hayes
- Modern ninja warfare, ninja tactics for the modern warrior, Antony Cummins
- Ninjas, Rupert Matthews
- Bar-jutsu, the American art of bar fighting, James Porco with John Monaco
- Ninja attack!, true tales of assassins, samurai, and outlaws, Hiroko Yoda and Matt Alt ; illustrations by Yutaka Kondo
- Ninjas, masters of stealth and secrecy, Patricia Dawson
- The ninja mind, Kevin Keitoshi Casey ; with a foreword by Stephen K. Hayes
- Ninjutsu, the art of the invisible warrior, Stephen K. Hayes
- The ancient art of ninja warfare, combat, espionage, and traditions, Stephen K. Hayes ; [all line drawings by Greg Manchess, karsji drawn by Rumiko Hayes]
- Where in the world can I-- become a ninja?, Shawn Brennan, writer
- Cyberjutsu, cybersecurity for the modern ninja, by Ben McCarty
- The way of the ninja, secret techniques, Masaaki Hatsumi ; translated by Ben Jones
- Ninja, by Jim Ollhoff
- The invisible fist, secret Ninja methods of vanishing without a trace, Ashida Kim