1. Ravitz MD, Leonard J (1959) Application of the Electrodynamic Field Theory in Biology, Psychiatry, Medicine and Hypnosis. American Journal of Clinical Hypnosis 1(4): 135-150.
2. Myss, Caroline (1996) Anatomy of the Spirit. Random House, New York, USA, p. 33-34.
3. Hoffman, Enid (1981) HUNA: A Beginner's Guide. Whitford Press, Atglen, Pennyslvania, USA, pp. 146-147.
4. Quillin, Patrick (1996) Healing Secrets from the Bible. The Nutrition Times Press, Tulsa, Oklahoma, USA, p. 68.
5. Rollin McCrary, McCraty's book, The Energetic Heart.