Mota-Rojas, Daniel; et al. (2021). «Efficacy and function of feathers, hair, and glabrous skin in the thermoregulation strategies of domestic animals». Animals (MDPI) 11: 3472. doi:10.3390/ani11123472. CS1 maint: Explicit use of et al. (link)
Artikkelen inneheld omsett tekst frå: Chisholm, Hugh, ed. (1911). Animal Heat. Encyclopædia Britannica. Vol. 2 (11th ed.). Cambridge University Press. pp. 48–50. This cites work of Simpson & Galbraith