Gruber, T., Potts, K. B., Krupenye, C., Byrne, M.-R., Mackworth-Young, C., McGrew, W. C., et al. (2012).
The influence of ecology on chimpanzee (Pan troglodytes) cultural behavior: A case study of five Ugandan chimpanzee communities. Journal of Comparative Psychology, 126(4), 446-457. doi:10.1037/a0028702.