• [Wiki] http://en.wikipedia.org/wiki/Gyps_coprotheres.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Gyps_africanus.
• [arkive] https://www.arkive.org/white-backed-vulture/gyps-coprotheres/.
• [globalraptors] http://www.globalraptors.org/grin/SpeciesResults.asp?specID=8263.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=F85BEEB442E4D57D&sec=lifehistory.
• [Kome1991] Komen, J. (1991). Growth in cape vulture nestlings. Ostrich, 62:149--155. doi:10.1080/00306525.1991.9639653.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PrinPres1991] Prinzinger, R., A.Preßmar, and Schleucher, E. (1991). Body temperature in birds. Comp. Biochem. Physiol., 99A(4):499--506. doi:10.1016/0300-9629(91)90122-S.