C. Ember and M. Ember, “Warfare, Aggression, and Resource Problems: Cross-Cultural Codes,” Behav Sci Res 26 (1992): 169; R. Textor, “Cross Cultural Summary: Human Relations Area Files” (1967); H. People and F. Marlowe, “Subsistence and the Evolution of Religion,” Hum Nat 23 (2012): 253.
