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Descriptive Catalog of the Birds of Illinois," part I of Ridgway, Robert, and Forbes, S.A., The Ornithology of Illinois. State Laboratory of Natural History
H.; Steadman, D.W.; Witt, C.C.; Yuri, T. (2008). „A Phylogenomic Study of Birds Reveals Their Evolutionary History”. Science. 320 (5884): 1763–68. Bibcode:2008Sci
-Cities/Charter_Cities-List, accesat în 7 aprilie 2020 Lipsește sau este vid: |title= (ajutor) ^ https://www.ci.vallejo.ca.us/cms/one.aspx
Clements Checklist of Birds of the World (ed. 6th). Ithaca: Cornell University Press. ISBN 978-0-8014-4501-9. ^ „Welcome”. IOC World Bird List 9.2. doi:10.14344/ioc
Cottrell, G. William, ed. (1979). Check-List of Birds of the World. 1 (ed. 2nd). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 275. ^ Simpson