Cita APA

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

Citación estilo Chicago

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

Cita MLA

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