APA (7th ed.) Citation

Ellison, W. G. (1992). Blue-gray gnatcatcher: Polioptila caerulea. American Ornithologists' Union ; The Academy of Natural Sciences.

Chicago Style (17th ed.) Citation

Ellison, Walter G. Blue-gray Gnatcatcher: Polioptila Caerulea. Washington, D.C. : Philadelphia, PA: American Ornithologists' Union ; The Academy of Natural Sciences, 1992.

MLA (9th ed.) Citation

Ellison, Walter G. Blue-gray Gnatcatcher: Polioptila Caerulea. American Ornithologists' Union ; The Academy of Natural Sciences, 1992.