"Gorillas on Thin Ice". United Nations Environment Programme. 15. januar 2009. Arkiveret fra originalen 18. maj 2016. Hentet 17. maj 2016.: "The Eastern Lowland Gorilla population in the DRC has plummeted dramatically over the last 10 years, with probably only about 5,000 of the formerly 17,000 animals remaining."
iucnredlist.org
iucnredlist.org
Plumptre, A.; Robbins, M.; Williamson, E. A. (2016). "Gorilla beringei ". IUCN Red List of Threatened Species. IUCN. 2016: e.T39994A17964126. Hentet 5. september 2016.{{cite journal}}: CS1-vedligeholdelse: Bruger authors parameter (link)
"Gorillas on Thin Ice". United Nations Environment Programme. 15. januar 2009. Arkiveret fra originalen 18. maj 2016. Hentet 17. maj 2016.: "The Eastern Lowland Gorilla population in the DRC has plummeted dramatically over the last 10 years, with probably only about 5,000 of the formerly 17,000 animals remaining."