Best Karate Series
By Masatoshi Nakayama
Vol. 1: Comprehensive
Vol. 2: Fundamentals
Vol. 3: Kumite I
Vol. 4: Kumite II
Vol. 5: Heian 1-5, Tekki 1-3
Vol. 6: Bassai-dai, Kanku-dai
Vol. 7: Jitte, Hangetsu, Empi
Vol. 8: Gankaku, Jion
Vol. 9: Bassai-sho, Kanku-sho, Chinte
Vol. 10: Unsu, Sochin, Nijushiho
Vol. 11: Gojushiho-sho, Gojushiho-dai, Meikyo

Dynamic Karate
By Masatoshi Nakayama

Karate-Do Kyohan, The Master Text
By Gichin Funakoshi

Karate-Do, My Way of Life
By Gichin Funakoshi

Moving Zen: Karate as a Way to Gentleness
By C.W. Nicol

A Book of Five Rings
By Miyamoto Musashi
Translated by Victor Harris

The Spirit of the Empty Hand
By Stan Schmidt

Meeting Myself-Beyond the Spirit of the Empty Hand
By Stan Schmidt

All Kata of Karate
By the Japan Karate Association
· Volume 1
· Volume 2
· Volume 3

JKA Kata - Original Series
By Masatoshi Nakayama
· Volume 1 - Heian 1, 2, 3
· Volume 2 - Heian 4, 5; Tekki 1
· Volume 3 - Tekki 2, 3
· Volume 4 - Bassai Dai
· Volume 5 - Kanku Dai
· Volume 6 - Jitte
· Volume 7 - Hangetsu
· Volume 8 - Enpi
· Volume 9 - Jion
· Volume 10 - Sochin
· Volume 11 - Unsu

Above are a few of the resources that we are fond of.  There are many additional works that may be of interest to karate-ka. Consider subjects that will increase your knowledge of Japanese culture.  Subjects such as history, philosophy, language, etc. may be of interest.

Be cautious of relying on resources concerning other styles of martial arts. The information may not be applicable to your organization's theories and guidelines.  The above resources pertain specifically to the practice of JKA/ISKF Shotokan Karate.  "Remember, true karate is only learned through practice!"