Proceedings of the Royal Society of London В (DOI 10.1098/rspb.2003. 2548).
229
Aiello, L., and Dean C. An introduction to human evolutionary anatomy. London: Academic Press, 1990.
230
Gallup, G. G. (Jr.). 1997. On the rise and fall of self-conception in primates. In The Self Across Psychology self-recognition, self-awareness, and the Self Concept. Annals of the NY Acad. Sci. 818:4-17.
