I'm a Ryukyu Kempo student and i think that the Geroge Dillman books are really useful to learn pressure points and the basically principles on it.
These books are simplified to be easy to learn and are not thought for healers, they are tought for martial artists.
I think, THIS IS MY OPINION, that every martial artist have to buy these books.
-ADVANCED PRESSURE POINT FIGHTING OF RYUKYU KEMPO - Dillman Theory For All Systems
-KYUSHO JITSU - The Dillman Method of Pressure Point Fighting
-TUITE - Advanced Pressure Point Grappling The Dillman Method of Instant Self-Defence
By George A. Dillman
You can find or buy these at www.dillman.com
Hi.. and good luck