• [Wiki] http://en.wikipedia.org/wiki/Harpia_harpyja.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=4D324C9C5A1A7566&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.
• [Rett1978] Retting, N. L. (1978). Breeding behaviour of the harpy eagle (Harpia harpyja). The Auk, 95(4):629--643.