APA (7th ed.) Citation

Purchon, R. D. (1968). The biology of the mollusca. Pergamon Press.

Chicago Style (17th ed.) Citation

Purchon, Richard D. The Biology of the Mollusca. Oxford [u.a.]: Pergamon Press, 1968.

MLA (9th ed.) Citation

Purchon, Richard D. The Biology of the Mollusca. Pergamon Press, 1968.