• [Wiki] http://en.wikipedia.org/wiki/Amazona_agilis.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=4B268FD25510C6CB&sec=lifehistory.
• [CollBoes2020] Collar, N. and Boesman, P. F. D. (2020). Black-billed parrot (Amazona agilis), version 1.0. in birds of the world (j. del hoyo, a. elliott, j. sargatal, d. a. christie, and e. de juana, editors). cornell lab of ornithology, ithaca, ny, usa. doi:10.2173/bow.blbpar1.01.
• [Koen2001] Koenig, S. E. (2001). The breeding biology of black-billed parrot Amazona agilis and yellow-billed parrot Amazona collaria in Cockpit Country, Jamaica. Bird Conservation International, 11:205–225.
• [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.