Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Skinner, Brian J., y Stefen C. Porter. Physical Geology. New York: J. Wiley, 1987.

Cita MLA (9a ed.)

Skinner, Brian J., y Stefen C. Porter. Physical Geology. J. Wiley, 1987.