• [Wiki] http://en.wikipedia.org/wiki/Pipilo_maculatus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Pipilo_maculatus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=0B0BC750365D5F26&sec=lifehistory.
• [KlutGlei2020] Kluttz, A. and Glei, D. A. (2020). Towhees. In Duerr, R. S. and Gage, L. J., editors, Hand-Rearing Birds, pages 719--730. doi:10.1002/9781119167792.
• [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.