English Language:

Rhythm and Touch
The Fundamentals of Craniosacral Therapy
Anthony P. Arnold, PH.D. 
ISBN: 978-1-55643-819-6 (1-55643-819-2) 
North Atlantic Books 2009
 

Spanish: 

Ritmo y Tacto. Principios Basicos de La Terapia

Craneosacral 

Dr. Anthony P. Arnold

ISBN-10: 8478087788 
Editorial Sirio, S.A.
29006 Málaga, ESPAÑA

German: (available but out of print)

Rhythmus & Berührung
Grundlagen und Praxis der Cranio-Sacral-Therapie
Goldmann Verlag, Munich, 2001
ISBN: 3-442-14203-2 

Italian (available but out of print):

Anthony Arnold 
Iniziazione alla Terapia Craniosacrale
Edizioni Mediterranee, Roma, 2000
ISBN 88-272-1324-4