APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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