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2. Bond, E. D.: Psychiatric Contributions to the Study of the Gastro-Intestinal System. Am. J. Dig. Dis., 5:482, 1938.
3. English, S. and Weiss, W.: Psychosomatic Medicine. W. B. Saunders Co., Philadelphia, 1943.
4. Ross, T. A.: The Common Neuroses. William Wood and Company, Baltimore, 1937.
5. Wolf, S. and Wolff, H. B.: Human Gastric Function. Oxford University Press, New York, 1943.