Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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