• [Wiki] http://en.wikipedia.org/wiki/Spizella_pusilla.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Spizella_pusilla.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=E23F6DE0B4829658&sec=lifehistory.
• [DawsEvan1957] Dawson, W. R. and Evans, F. C. (1957). Relation of growth and development to temperature regulation in nestling field and chipping sparrows. Physiological Zoology, 30(4):315–327. doi:10.1086/physzool.30.4.30152213.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.