Παραπομπή APA

Skinner, B. J., & Porter, S. C. (1989). Dynamic earth: :An introduction to physical geology. Wiley.

Παραπομπή Chicago Style

Skinner, Brian J., και Stephen C. Porter. Dynamic Earth: :An Introduction to Physical Geology. New York: Wiley, 1989.

Παραπομπή MLA

Skinner, Brian J., και Stephen C. Porter. Dynamic Earth: :An Introduction to Physical Geology. Wiley, 1989.