• [Wiki] http://en.wikipedia.org/wiki/Pipilo_erythrophthalmus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=6090278A61F63C13&sec=lifehistory.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Pipilo_erythrophthalmus.
• [Barb1950] Barbour, R. W. (1950). Growth and feather development of towhee nestlings. The American Midland Naturalist, 44(3):742--749.
• [Gree2020] Greenlaw, J. S. (2020). Eastern towhee (Pipilo erythrophthalmus), version 1.0. in birds of the world (p. g. rodewald, editor). cornell lab of ornithology, ithaca, ny, usa. doi:10.2173/bow.eastow.01.
• [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.