• [Wiki] http://en.wikipedia.org/wiki/Zonotrichia_atricapilla.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=BD61BDEC7D0A1633&sec=lifehistory.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Zonotrichia_atricapilla.
• [Hend1987] Hendricks, P. (1987). Breeding biology and nestling development of golden-crowned sparrows in Alaska. The Wilson Bulletin, 99(4):19--34.
• [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.