• [Wiki] http://en.wikipedia.org/wiki/Glaucidium_brasilianum.
• [ADW] https://animaldiversity.org/accounts/Glaucidium_brasilianum/.
• [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.
• [ProuJohn2020] Proudfoot, G. A., Johnson, R. R., and Larsen, R. (2020). Ferruginous pygmy-owl (Glaucidium brasilianum), version 1.0. in birds of the world (s. m. billerman, editor). cornell lab of ornithology, ithaca, ny, usa. doi:10.2173/bow.fepowl.01.