Orlaith Fraser and Filippo Aureli (2008).
371
Filippo Aureli and Frans de Waal (2000).
372
Elisabetta Palagi et al. (2004); Zanna Clay and Frans de Waal (2015).
373
Susan Nolen-Hoeksema et al. (2008).
374
Neil Brewer et al. (2002); Julia Bear et al. (2014).
375
Sarah Blaffer Hrdy (2009).
376
Sandra Boodman (2013).
377
Laura Jones et al. (2018).
378
Ingo Titze and Daniel Martin (1998).
379
Monica Hesse (2019); David Moye (2019).
380