APA (7th ed.) Citation

Comstock, J. H., & Herrick, G. W. (1940). An introduction to entomology (9th ed.). Comstock Pub.

Chicago Style (17th ed.) Citation

Comstock, John Henry, and Glenn Washington Herrick. An Introduction to Entomology. 9th ed. New York: Comstock Pub, 1940.

MLA (9th ed.) Citation

Comstock, John Henry, and Glenn Washington Herrick. An Introduction to Entomology. 9th ed. Comstock Pub, 1940.