Krisis Populasi, Kami Ada Untukmu, Orangutan!

[4]  Tshen, L. T. (2016) 'Biogeographic distribution and metric dental variation of fossil and living orangutans (Pongo spp.)', Primates. Springer Japan, 57(1), pp. 39--50. doi: 10.1007/s10329-015-0493-z.

[5] Wich, S. A. et al. (2008) 'Distribution and conservation status of the orang-utan (Pongo spp.) on Borneo and Sumatra: How many remain?', Oryx, 42(3), pp. 329--339. doi: 10.1017/S003060530800197X.