The following books are recommended reading to supplement your training. They can be purchased on-line.

Shorin-Ryu Okinawan Karate Question and Answer Book

(aka. The Red Book) by Robert Scaglione and William Cummins

Karate of Okinawa Building Warrior Spirit with Gan, Soku, Tanden, Riki

(aka. The Green Book) by Robert Scaglione and William Cummins

The Essence of Okinawan Karate-Do

by Shoshin Nagamine