1. Ammann, K., 1998. The conservation status of the bonobo in the one million hectare Siforzal/Danzer logging concession in central D.R.Congo. Website: (http://biosynergy.org/bushmeat/)
2. Pygmy chimpanzees;Badrian;Oryx,1977
3. IUCN Red List of Threatened Animals;Baillie,1996
4. Dupain, J., Van Elsacker, E., 1999. Bonobo in situ. Iyema. Update No. 2, 7 April, EEP-Newletter.
5. Dupain, J., Van Krunkelsven, E., Van Elsacker, L., 1996. Bonobo in situ. Iyema. Update No. 1, 1 June, EEP-Newsletter.