59
Simon Baron-Cohen (2005), p. 170.
60
David Neal and Tanya Chartrand (2011).
61
Толстой Л. Н. Лев и собачка (1904).
62
Cat Hobaiter and Richard Byrne (2010).
63
Katy Payne (1998), p. 63.
64
Yasuo Nagasaka et al. (2013).
65
Susan Perry et al. (2003).
66
Annika Paukner et al. (2009).
67
Matthew Campbell and Frans de Waal (2011).
68
Ivan Norscia and Elisabetta Palagi (2011).