Mittermeier, Russell A.; Anthony B. Rylands; Christoph Schwitzer; Lucy A. Taylor; Federica Chiozza; Elizabeth A. Williamson (2012). Primates in Peril: The World's 25 Most Endangered Primates 2010–2012(PDF) (Report). IUCN/SSC Primate Specialist Group (PSG); International Primatological Society (IPS); Conservation International (CI), Arlington, VA. Retrieved 2022-10-20.