• [Wiki] http://en.wikipedia.org/wiki/Gypaetus_barbatus.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Gypaetus_barbatus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=81DB7410BE70406B&sec=lifehistory.
• [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.
• [ZwarHage1991] Zwart, V. P., van der Hage, M. H., van Rest, F. J. M., and Louwman, J. W. W. (1991). Handraising a bearded vulture Gypaetus barbatus, with the aid of a commercial cat-food. Zool. Garten N. F., 61(3):149--156. doi:10.1080/00306525.1975.9639381.