• [Wiki] http://en.wikipedia.org/wiki/Junco_hyemalis.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=05FF3C9B3C854D53&sec=lifehistory.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
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• [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.