• [Wiki] http://en.wikipedia.org/wiki/Ninox_strenua.
• [ADW] https://animaldiversity.org/accounts/Ninox_strenua/.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=2DF7793A341CF7C9&sec=lifehistory.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [OlseMark2020] Olsen, P., Marks, J. S., and Kirwan, G. M. (2020). Powerful owl (Ninox strenua), version 1.0. in birds of the world (s. m. billerman, b. k. keeney, p. g. rodewald, and t. s. schulenberg, editors). cornell lab of ornithology, ithaca, ny, usa. doi:10.2173/bow.powowl1.01.
• [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.