Morris, P. (1974). A field guide to Pacific Coast shells, including shells of Hawaii and the Gulf of Califorinia: Percy A. Morris (2nd edition., revised and enlarged.). Houghton Mifflin Co.
Chicago-referens (17:e uppl.)Morris, Percy.A. A Field Guide to Pacific Coast Shells, Including Shells of Hawaii and the Gulf of Califorinia: Percy A. Morris. 2nd edition., revised and enlarged. Boston, Massachusetts: Houghton Mifflin Co, 1974.
MLA-referens (9:e uppl.)Morris, Percy.A. A Field Guide to Pacific Coast Shells, Including Shells of Hawaii and the Gulf of Califorinia: Percy A. Morris. 2nd edition., revised and enlarged. Houghton Mifflin Co, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.