APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Skinner, Brian J., and Stephen C. Porter. Physical Geology. New York: John Wiley & Sons, 1987.

MLA (8th ed.) Citation

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