APA (7th ed.) Citation

Essig, E. O. (1932). A genus and species of the family Aphididae new to North America. Univ. of California Press.

Chicago Style (17th ed.) Citation

Essig, E. O. A Genus and Species of the Family Aphididae New to North America. Berkeley, Calif: Univ. of California Press, 1932.

MLA (9th ed.) Citation

Essig, E. O. A Genus and Species of the Family Aphididae New to North America. Univ. of California Press, 1932.