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421
Carol Clark, Five surprising facts about fathers, Emory University, http://news.emory.edu/features/2019/06/five-facts-fathers.
422
James Rilling and Jennifer Mascaro (2017).
423
Margaret Mead (1949), p. 145.
424
Sarah Blaffer Hrdy (2009), p. 109.
425
Frans de Waal (2013), p. 139; Elisa Demuru et al. (2018).
426
Lynn Fairbanks (2000).
427
Darren Croft et al. (2017).
428
Kristen Hawkes and James Coxworth (2013); Simon Chapman et al. (2019).
429
Charles Weisbard and Robert Goy (1976).
430