एपीए उद्धरण

Lutgens, K. F., & Tarbuck, E. J. (1989). Essentials of geology/3rd ed (3rd ed.). Merrill.

शिकागो स्टाइल उद्धरण

Lutgens, K. Frederick, और Edward J. Tarbuck. Essentials of Geology/3rd Ed. 3rd ed. London: Merrill, 1989.

एमएलए उद्धरण

Lutgens, K. Frederick, और Edward J. Tarbuck. Essentials of Geology/3rd Ed. 3rd ed. Merrill, 1989.