1. Huxley L: Life and letters of Thomas H. Huxley. 1901, New York: D. Appleton and Co, I:
2. Sutherland WG: The cranial bowl. 1939, USA: Free Press Company
3. King HH, Lay EM: Osteopathy in the cranial field. Foundations for osteopathic medicine. Edited by: Ward RC. 2002, New York: Lippincott Williams & Wilkins, 985-1001. 2
4. The Cranial Academy: Osteopathy in the cranial field. 2006, Accessed April 22, 2006, [ http://www.cranialacademy.com/cranial.html ]
5. Upledger JE, Vredevoogd JD: Craniosacral therapy. 1983, Chicago: Eastland Press