APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Comstock, John Henry, and Glenn W. Herrick. An Introduction to Entomology. 9th ed. rev. Ithaca, N.Y.: Comstock pub. co., 1940.

MLA (9th ed.) Citation

Comstock, John Henry, and Glenn W. Herrick. An Introduction to Entomology. 9th ed. rev. Comstock pub. co., 1940.