APA (7th ed.) Citation

Frey-Gessner, E. Hymenoptera: Apidae. Bolli & Böcherer.

Chicago Style (17th ed.) Citation

Frey-Gessner, Emil. Hymenoptera: Apidae. Schaffhausen: Bolli & Böcherer.

MLA (9th ed.) Citation

Frey-Gessner, Emil. Hymenoptera: Apidae. Bolli & Böcherer.

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