• [Wiki] http://en.wikipedia.org/wiki/Neophron_percnopterus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Neophron_percnopterus.
• [arkive] https://www.arkive.org/white-backed-vulture/neophron-percnopterus/.
• [EoL] http://eol.org/pages/914577/details.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=6D3480A64B4953CE&sec=lifehistory.
• [DonaCeba1989] Donazari, J. A. and Ceballos, O. (1989). Growth rates of nestling Egyptian vultures Neophron percnopterus in relation to brood size, hatching order and environmental factors. Ardea, 77:217--226.
• [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.