Παραπομπή APA

Essig, E. O. (1972). History of entomology. Hafner.

Παραπομπή Chicago Style

Essig, E O. History of Entomology. New York: Hafner, 1972.

Παραπομπή MLA

Essig, E O. History of Entomology. Hafner, 1972.