APA (7th ed.) Citation

Atwood, J. L. (1988). Speciation and geographic variation in black-tailed gnatcatchers. The American Ornithologists' Union.

Chicago Style (17th ed.) Citation

Atwood, Jonathan L. Speciation and Geographic Variation in Black-tailed Gnatcatchers. Washington, D.C.: The American Ornithologists' Union, 1988.

MLA (9th ed.) Citation

Atwood, Jonathan L. Speciation and Geographic Variation in Black-tailed Gnatcatchers. The American Ornithologists' Union, 1988.