Woodall, Peter (2001). "Family Alcedinidae (Kingfishers)". In del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi (eds.). Handbook of the Birds of the World. Vol. Volume 6, Mousebirds to Hornbills. Barcelona: Lynx Edicions. pp. 103–187. ISBN978-84-87334-30-6. {{cite book}}: |volume= has extra text (help)
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Bancroft, Wilder; Chamot, Emile M.; Merritt, Ernest; Mason, Clyde W. (1923). "Blue feathers"(PDF). The Auk. 40 (2): 275–300. doi:10.2307/4073818.
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sora.unm.edu
Bancroft, Wilder; Chamot, Emile M.; Merritt, Ernest; Mason, Clyde W. (1923). "Blue feathers"(PDF). The Auk. 40 (2): 275–300. doi:10.2307/4073818.