Hans Kruuk, The Spotted Hyena: A Study of Predation and Social Behavior (University of Chicago Press, Chicago, 1972).
119
R. G. Sipes, War, Sports and Aggression: An Empirical Test of Two Rival Theories, American Anthropologist 75: 64—86 (1973); новые данные об исследованиях Сайпса см. Science News, December 13, 1975, р. 375.
