Gaya APA

Tasa, D., Lutgens, I, F, K. (2008). Essentials of Geology: International Edition . Paperback, 2008: Paperback, 2008.

Gaya MLA

Tasa, Dennis., Lutgens, I., Frederick, K.. "Essentials of Geology: International Edition". Paperback, 2008: Paperback, 2008, 2008. .