• [Wiki] http://en.wikipedia.org/wiki/Euptilotis_neoxenus.
• [Planet] www.planetofbirds.com.
• [AZ_Anim] http://a-z-animals.com/animals/quetzal/.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=83AB5D3D4D0EAA16&sec=lifehistory.
• [GonzCruz2008] González-Rojas, J. I., Cruz-Nieto, J., Ruvalcaba-Ortega, I., and Cruz-Nieto, M. A. (2008). Breeding biology of eared quetzals in the sierra madre occidental, mexico. Journal of Field Ornithology, 79(1):20--23.
• [HollRome2012] Holland, G. and Romer, L. (2012). http://www.aszk.org.au.
• [John2000] Johnsgard, P. A. (2000). Trogons and Quetzals of the World. Smithsonian Institution Press, Washington, DC.
• [KeslHaig2004] Kesler, D. C. and Haig, S. M. (2004). Thermal characteristics of wild and captive micronesian kingfisher nesting habitats. Zoo Biology, 23:301--308.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [Orel2004] Orellana, C. (2004). Quetzals bred in captivity in Chiapas. Frontiers in ecology and the environment, 2(7):345.
• [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.
• [Will1992] Williamson, S. L. (1992). The eared trogon in Arizona: Behavior, ecology, and management of the "northern quetzal". In Proceedings of the Chiricahua Mountains Research Symposium, 15-16 March 1992., pages 98--101. Southwest Parks and Monuments Association, Tucson, Arizona.