APA (7th ed.) Citation

Klots, A. B. (1951). A Field guide to the butterflies of North America, east of the Great Plains. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Klots, Alexander Barrett. A Field Guide to the Butterflies of North America, East of the Great Plains. Boston: Houghton Mifflin, 1951.

MLA (9th ed.) Citation

Klots, Alexander Barrett. A Field Guide to the Butterflies of North America, East of the Great Plains. Houghton Mifflin, 1951.