APA (7th ed.) Citation

Keen, M. J. (1968). An introduction to marine geology ([1st ed.].). Pergamon Press.

Chicago Style (17th ed.) Citation

Keen, Michael John. An Introduction to Marine Geology. [1st ed.]. Oxford: Pergamon Press, 1968.

MLA (9th ed.) Citation

Keen, Michael John. An Introduction to Marine Geology. [1st ed.]. Pergamon Press, 1968.