APA (7th ed.) Citation

Richardson, L. Helicidae: Catalog of species. Department of Malacology, Acad. of Natural Sciences.

Chicago Style (17th ed.) Citation

Richardson, Leonard. Helicidae: Catalog of Species. Philadelphia: Department of Malacology, Acad. of Natural Sciences.

MLA (9th ed.) Citation

Richardson, Leonard. Helicidae: Catalog of Species. Department of Malacology, Acad. of Natural Sciences.

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