APA (7th ed.) Citation

Howe, W. H., & Bauer, D. L. (1975). The Butterflies of North America. Doubleday.

Chicago Style (17th ed.) Citation

Howe, William H., and David L. Bauer. The Butterflies of North America. Garden City, N.Y.: Doubleday, 1975.

MLA (9th ed.) Citation

Howe, William H., and David L. Bauer. The Butterflies of North America. Doubleday, 1975.