Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.