van Casteren, A., Sellers, W. I., Thorpe, S. K. S., Coward, S., Crompton, R. H., Myatt, J. P., & Ennos, A. R. (2012). Nest-building orangutans demonstrate engineering know-how to produce safe, comfortable beds. National Academy of Sciences.

van Casteren, Adam, William I. Sellers, Susannah K. S. Thorpe, Sam Coward, Robin H. Crompton, Julia P. Myatt, e A. Roland Ennos. Nest-building Orangutans Demonstrate Engineering Know-how to Produce Safe, Comfortable Beds. National Academy of Sciences, 2012.

van Casteren, Adam, et al. Nest-building Orangutans Demonstrate Engineering Know-how to Produce Safe, Comfortable Beds. National Academy of Sciences, 2012.