Books
N.B. No book can replace a qualified instructor. Whilst these books may be of interest they do not relate directly to the style of Jitsu taught within the Jitsu Foundation and may contain techniques which are dangerous.
"Hagakure, the book of the Samurai" - Yamamoto Tsunemtomo
Philosophical observations of Samurai life
"The Art of War" - Sun Tzu
The philosophy of war and conflict in general
"The Art of Japanese Swordsmanship" - Nicklaus Suino
Manual of Eishin-Ryu Iaido (sword drawing techniques)
"Japan's Ultimate Martial Art" - Darrell Max Craig
Jujitsu before 1882 - the classical Japanese art of self defense
"JuJitsu Nerve Techniques, the Invisible Weapon of Self-defense" - George Kirby
Does exactly what it says on the tin
"The Encyclopedia of Dim Mak, the Main Meridians" - Erle Montaigue & Wally Simpson
Chinese energy channel theory which has application in nerve techniques
"Angry White Pyjamas" - Robert Twigger
A lighter look at what it means to study a martial art