Here you may find a selection of valuable books about the practice and background of various Japanese (martial) arts.
Z.N.K.R. iaido and Nippon Kendo Kata
Zen Nippon Kendo Renmei Iai, English version manual, A.J.K.F. March 2004
Nippon Kendo Kata, Instruction manual, A.J.K.F. March 2002
Japanese Swordmanship. Technique and practice, G. Warner, D.F. Draeger, Weatherhill, New York 1993
Looking at a far mountain. A study of kendo kata, Budden P., Tuttle, Boston 2000
Shinkage ryu iaido
Iaido - The history, teachings and practice of Japanese swordmanship, W. de Lange with Akita M. sensei, Weatherhill, Turnbull 2002
The unfettered mind, Takuan Soho, Kodansha, Tokyo 1986
The Sword & The Mind, Sato H. (ed.), The Overlook Press, Woodstock 1985
The Japanese sword
The Craft of the Japanese Sword, L., H. Kapp, Yoshindo Y., Kodansha, Tokyo 1987
The Japanese Sword, Sato K., Kodansha, Tokyo 1978
The conoisseur's book of Japanese swords, Nagayama K., Kodansha, Tokyo 1997
Background
Classical Bujutsu. The Martial Arts and Ways of Japan I, D.F. Draeger, Weatherhill, New York 1990
Classical Budo. The Martial Arts and Ways of Japan II, D.F. Draeger, Weatherhill, New York 1990
Modern Bujutsu and Budo. The Martial Arts and Ways of Japan III, D.F. Draeger, Weatherhill, New York 1990
The Samurai Sourcebook, S. Turnbull, Arms and Armour Press, London 1998