M. M. Lahr et al., “Inter-group Violence Among Early Holocene Hunter-Gatherers of West Turkana, Kenya,” Nat 529 (2016): 394.
534
C. Boehm, Moral Origins: The Evolution of Virtue, Altruism, and Shame (New York: Basic Books, 2012).
535
M. C. Stiner et al., “Cooperative Hunting and Meat Sharing 400–200 kya at Qesem Cave, Israel,” PNAS 106 (2009): 13207.
536
P. Wiessner, “The Embers of Society: Firelight Talk Among the Ju / ’hoansi Bushmen,” PNAS 111 (2014): 14013; P. Wiessner, “Norm Enforcement Among the Ju / ’hoansi Bushmen: A Case of Strong Reciprocity?” Hum Nat 16 (2004): 115.