APA (7th ed.) Citation

Skinner, B. J., & Porter, S. C. (1987). Physical geology. Wiley.

Chicago Style (17th ed.) Citation

Skinner, Brian J., and Stephen C. Porter. Physical Geology. New York u.a: Wiley, 1987.

MLA (9th ed.) Citation

Skinner, Brian J., and Stephen C. Porter. Physical Geology. Wiley, 1987.