Cita APA (7th ed.)

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.

Cita Chicago (17th ed.)

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.

Cita MLA (9th ed.)

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.