R. Dunbar, Grooming, Gossip, and the Evolution of Language (Cambridge, MA: Harvard University Press, 1996).
36
R. W. Wrangham. An ecological model of female-bonded primate groups // Behaviour 75 (1980): 262–300.
37
S. E. Taylor et al. Biobehavioral responses to stress in females: Tend-and-befriend, not fight-or-flight // Psychological Review 107, no. 3 (July 2000): 411–429.