Cassin's kingbird (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cassin's kingbird" in English language version.

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allaboutbirds.org

"Cassin's Kingbird Identification". All About Birds. Cornell Lab of Ornithology. Retrieved 2020-09-26.

Swainson, William John (1826). "On the tyrant strikes of America". Quarterly Journal of Science, Literature and the Arts. 20: 267–285 [273–274].
Traylor, Melvin A. Jr, ed. (1979). Check-List of Birds of the World. Vol. 8. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 224.

"Cassin's Kingbird". Montana Field Guide. Montana Natural Heritage Program and Montana Fish, Wildlife and Parks. Retrieved 2020-09-26.

Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (2020). "Tyrant flycatchers". IOC World Bird List Version 10.2. International Ornithologists' Union. Retrieved 9 October 2020.