1. Altmann, J. (1974). Observational study of behaviour: Sampling methods. Behaviour, 49, 227–265.
2. Anderson, J. R. (2007). Animal behaviour: Tolerant primates cooperate best. Current Biology, 17, 242–243.
3. Boesch, C., & Boesch, H. (1989). Hunting behavior of wild chimpanzees in the Taï National Park. American Journal of Physical Anthropology, 78, 547–573.
4. Boinski, S., Treves, A., & Chapman, C. A. (2000). A critical evaluation of the influence of predators on Primates: Effects on group travel. In S. Boinski, & P. A. Garber (Eds.), On the move (pp. 43–72). Chicago: University of Chicago Press.
5. Borgatti, S. P., Everett, M. G., & Freeman, L. C. (2002). UCINET for Windows: Software for Social Network Analysis. Harvard: Analytic technologies.