APA (7th ed.) Citation

Comstock, J. H. (1940). An Introduction to entomology. Comstock Publishing.

Chicago Style (17th ed.) Citation

Comstock, John Henry. An Introduction to Entomology. Ithaca: Comstock Publishing, 1940.

MLA (9th ed.) Citation

Comstock, John Henry. An Introduction to Entomology. Comstock Publishing, 1940.

Warning: These citations may not always be 100% accurate.