Dyfyniad APA

Clark, J. O. (2003). Universities Press Dictionary of Earth Sciences. Universities Press.

Dyfyniad Arddull Chicago

Clark, John O.E. Universities Press Dictionary of Earth Sciences. New York: Universities Press, 2003.

Dyfyniad MLA

Clark, John O.E. Universities Press Dictionary of Earth Sciences. Universities Press, 2003.

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