APA (7th ed.) Citation

Purchon, R. D. (1977). The biology of the Mollusca (2d ed.). Pergamon Press.

Chicago Style (17th ed.) Citation

Purchon, R. D. The Biology of the Mollusca. 2d ed. Oxford: Pergamon Press, 1977.

MLA (9th ed.) Citation

Purchon, R. D. The Biology of the Mollusca. 2d ed. Pergamon Press, 1977.