1. Jung Carl C.: Approaching the Unconscious in Man and His Symbols, ed. by Carl Jung, Dell, New York, 1975, p. 4.
2. Empirical Aztec Medicine
3. Castiglione: A History of Medicine, Alfred Knopf, New York, 1941, p. 104.
4. The Yellow Emperor's Classic of Internal Medicine, Transl. by Veith Ilza, University of California Press, Berkeley and Los Angeles, 1966, p. 53 introduction.