APA استشهاد

Gilluly, J. (1968). Principles of geology (3rd ed.). W H Freeman.

استشهاد بنمط شيكاغو

Gilluly, James. Principles of Geology. 3rd ed. Sanfrancisco: W H Freeman, 1968.

MLA استشهاد

Gilluly, James. Principles of Geology. 3rd ed. W H Freeman, 1968.