APA (7th ed.) Citation

Keen, M. J. (1969). An introduction to marine geology (Reprint.). Pergamon Press.

Chicago Style (17th ed.) Citation

Keen, Michael J. An Introduction to Marine Geology. Reprint. Oxford [u.a.]: Pergamon Press, 1969.

MLA (9th ed.) Citation

Keen, Michael J. An Introduction to Marine Geology. Reprint. Pergamon Press, 1969.