12
Thomas Dixon, The History of Emotions Blog, April 2, 2020, emotionsblog.history.qmul.ac.uk.
13
Amy Maxmen, Sexual Competition Among Ducks Wreaks Havoc on Penis Size, Nature 549 (2017): 443.
14
Kate Wong, Why Humans Give Birth to Helpless Babies, Scientific American, 28 августа 2012 г.