APA (7th ed.) Citation

Johannsen, O. A., & Thomsen, L. C. (1969). Aquatic diptera. Entomological Reprint Specialists.

Chicago Style (17th ed.) Citation

Johannsen, O. A., and Lillian Clara Thomsen. Aquatic Diptera. Los Angeles, Calif.: Entomological Reprint Specialists, 1969.

MLA (9th ed.) Citation

Johannsen, O. A., and Lillian Clara Thomsen. Aquatic Diptera. Entomological Reprint Specialists, 1969.