APA (7th ed.) Citation

Torre Espinosa, C. d. l., Bartsch, P., & Morrison, J. P. E. (1942). The cyclophorid operculate Land Mollusks of America. United States Government Printing Office.

Chicago Style (17th ed.) Citation

Torre Espinosa, Carlos de la, Paul Bartsch, and Joseph P. E. Morrison. The Cyclophorid Operculate Land Mollusks of America. Washington: United States Government Printing Office, 1942.

MLA (9th ed.) Citation

Torre Espinosa, Carlos de la, et al. The Cyclophorid Operculate Land Mollusks of America. United States Government Printing Office, 1942.