- [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.