Bibliography and Citations
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Harlequin duck (Histrionicus histrionicus). 466. Poole A, Gill F., editors. Philadelphia: The Academy of Natural Sciences of Philadelphia and the American Ornithologists' Union. p. 32. Available from http://bna.birds.cornell.edu/bna/species/466/
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1999. Harlequin duck (Histrionicus histrionicus). Birds of North America Online. (466) Available from http://bna.birds.cornell.edu/bna/species/466/
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1999. Spacing patterns, mating systems, and winter philopatry in harlequin ducks. Auk. 117(2):299-307. Available from http://www.jstor.org/stable/4089712
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2000.