1. Ader, R Adrenocortical function and the measurement of “emotionality.” Annals of the New York Academy of Sciences, 1969, 159, 791–805.
2. Badr, F. M., & Spickett, S. G. Genetic variation in adrenal weight in young adult mice. Journal of Endocrinology, 1971, 49, 105–111.
3. Brown, W. H., Pearce, L., & Van Allen, C. M. The occurrence and trend of spontaneous variations in organ weights of normal rabbits. Journal of Experimental Medicine, 1926, 44, 653–666.
4. Chai, C., & Dickie, M. Endocrine variations. In E. L. Green (Ed.), Biology of the laboratory mouse. New York: McGraw-Hill, 1966. Pp. 387–403.
5. Denenberg, V. H. Stimulation in infancy, emotional reactivity, and exploratory behavior. In D. C. Glass (Ed.), Neurophysiology and emotion. New York: Rockefeller University Press and Russell Sage Foundation, 1967. Pp. 161–190.