Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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