APA (7e ed.) Bronvermelding

Plummer, C. (1985). Introduction to physical geology. Macmillan.

Chicago (17e ed.) Bronvermelding

Plummer, Charles. Introduction to Physical Geology. New York: Macmillan, 1985.

MLA (9e ed.) Bronvermelding

Plummer, Charles. Introduction to Physical Geology. Macmillan, 1985.