Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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