Williams, J. M., Liu, H., & Pusey, A. (2002). Costs and benefits of grouping for female chimpanzees at Gombe. In C. Boesch, L. Marchant, & G. Hohmann (Eds.), Behavioural Diversity in Chimpanzees and Bonobos (pp. 192–203). Cambridge: Cambridge University Press.

Williams, J. M., H. Liu, and A. Pusey. “Costs and benefits of grouping for female chimpanzees at Gombe.” In Behavioural Diversity in Chimpanzees and Bonobos, edited by C. Boesch, L. Marchant, and G. Hohmann, 192–203. Cambridge: Cambridge University Press, 2002.

Williams JM, Liu H, Pusey A. Costs and benefits of grouping for female chimpanzees at Gombe. In: Boesch C, Marchant L, Hohmann G, editors. Behavioural Diversity in Chimpanzees and Bonobos. Cambridge: Cambridge University Press; 2002. p. 192–203.

Williams, J. M., et al. “Costs and benefits of grouping for female chimpanzees at Gombe.” Behavioural Diversity in Chimpanzees and Bonobos, edited by C. Boesch et al., Cambridge University Press, 2002, pp. 192–203.

Williams JM, Liu H, Pusey A. Costs and benefits of grouping for female chimpanzees at Gombe. In: Boesch C, Marchant L, Hohmann G, editors. Behavioural Diversity in Chimpanzees and Bonobos. Cambridge: Cambridge University Press; 2002. p. 192–203.