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.