APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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