1. Aiello, L., & Wheeler, P. (1995). The expensive tissue hypothesis: The brain and the digestive system in human and primate evolution. Current Anthropology, 36, 199–221.
2. Bogin, B. (2009). Childhood, adolescence, and longevity: A multilevel model of the evolution of reserve capacity in human life history. American Journal of Human Biology, 21, 567–577.
3. Dunbar, R. I. M. (1997). Grooming, gossip and the evolution of language. Cambridge, MA: Harvard University Press.
4. Fleagle, J. G. (1999). Primate adaptation and evolution (2nd ed.). San Diego: Academic.
5. Jaeggi, A. V., & van Schaik, C. P. (2011). The evolution of food sharing in primates. Behavioral Ecology and Sociobiology, 65, 2125–2140.