APA (7th ed.) Citation

Keen, A. M. (1971). Sea shells of tropical west America: Marine mollusks from Baja California to Peru (2d ed.). Stanford University Press.

Chicago Style (17th ed.) Citation

Keen, Angeline Myra. Sea Shells of Tropical West America: Marine Mollusks from Baja California to Peru. 2d ed. Stanford, Calif: Stanford University Press, 1971.

MLA (9th ed.) Citation

Keen, Angeline Myra. Sea Shells of Tropical West America: Marine Mollusks from Baja California to Peru. 2d ed. Stanford University Press, 1971.