1. Larson LA. ed. Encyclopedia of Sport Sciences and Medicine. New York: The MacMillan Co., 1971, pp. 288–293.
2. Schauf CL, Moffett DF, Moffett SB. Human Physiology: Foundations and Frontiers. Toronto: Times Mirror/Mosby College Publishing, 1990, pp. 3–15, 256, 261, 285, 301–303.