APA (7th ed.) Citation

Keen, M. J. (1968). An introduction to marine geology. Pergamon Press.

Chicago Style (17th ed.) Citation

Keen, M. J. An Introduction to Marine Geology. Oxford, Uk: Pergamon Press, 1968.

MLA (9th ed.) Citation

Keen, M. J. An Introduction to Marine Geology. Pergamon Press, 1968.