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http://en.wikipedia.org/wiki/Aythya_americana.
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http://genomics.senescence.info/species/entry.php?species=Aythya_americana.
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http://animaldiversity.org/accounts/Aythya_americana/.
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http://www.eol.org/pages/1048964/overview/.
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Kooijman, S. (2010).
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Prinzinger, R., A.Preßmar, and Schleucher, E. (1991).
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Weller, M. W. (1957).
Growth, weights, and plumages of the redhead, Aythya
americana.
The Wilson Bulletin, 69(1):5--38.