N. Mahajan et al., “The Evolution of Intergroup Bias: Perceptions and Attitudes in Rhesus Macaques,” JPSP 100 (2011): 387.
617
H. Tajfel, “Social Psychology of Intergroup Relations,” Ann Rev of Psych 33 (1982): 1; H. Tajfel, “Experiments in Intergroup Discrimination,” Sci Am 223 (1970): 96.
