Gaya APA

Morris, P, A. (1975). A field guide to shells of the Atlantic and Gulf Coasts and the West Indies (3rd ed.). Boston: Houghton Mifflin Company.

Gaya MLA

Morris, Percy, A.. "A field guide to shells of the Atlantic and Gulf Coasts and the West Indies". 3rd ed. Boston: Houghton Mifflin Company, 1975. Text.