Coues, E. (1892). Key to North American birds: Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California (4th ed.). Estes and Lauriat.

Coues, Elliott. Key to North American Birds: Containing a Concise Account of Every Species of Living and Fossil Bird at Present Known from the Continent North of the Mexican and United States Boundary, Inclusive of Greenland and Lower California. 4th ed. Boston: Estes and Lauriat, 1892.

Coues, Elliott. Key to North American Birds: Containing a Concise Account of Every Species of Living and Fossil Bird at Present Known from the Continent North of the Mexican and United States Boundary, Inclusive of Greenland and Lower California. 4th ed. Estes and Lauriat, 1892.