APA استشهاد

Marshak, S. (2009). Essentials of geology (3rd.ed.). W.W.Norton.

استشهاد بنمط شيكاغو

Marshak, Stephen. Essentials of Geology. 3rd.ed. New York: W.W.Norton, 2009.

MLA استشهاد

Marshak, Stephen. Essentials of Geology. 3rd.ed. W.W.Norton, 2009.