• [Wiki] http://en.wikipedia.org/wiki/Aythya_americana.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Aythya_americana.
• [ADW] http://animaldiversity.org/accounts/Aythya_americana/.
• [EOL] http://www.eol.org/pages/1048964/overview/.
• [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.
• [Well1957] Weller, M. W. (1957). Growth, weights, and plumages of the redhead, Aythya americana. The Wilson Bulletin, 69(1):5--38.