• [Wiki] http://en.wikipedia.org/wiki/Aquila_spilogaster.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=9A418C4525EAB2B1&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.
• [Stey1975] Steyn, P. (1975). Observations on the African hawk-eagle. Ostrich, 46(1):87–105. doi:10.1080/00306525.1975.9639384.