APA (7th ed.) Citation

Wolf, L. L., & Hardy, J. W. (1977). Species relationships in the avian genus Aimophila. American Ornithologists' Union.

Chicago Style (17th ed.) Citation

Wolf, Larry L., and John William Hardy. Species Relationships in the Avian Genus Aimophila. [Washington, D.C.]: American Ornithologists' Union, 1977.

MLA (9th ed.) Citation

Wolf, Larry L., and John William Hardy. Species Relationships in the Avian Genus Aimophila. American Ornithologists' Union, 1977.