Gaya APA

Tarbuck, E, J., Lutgens, F, K. (2008). Earth: an introduction to physical geology (9th ed.). New Jersey: Pearson Education.

Gaya MLA

Tarbuck, Edward, J.., Lutgens, Frederick, K.. "Earth: an introduction to physical geology". 9th ed. New Jersey: Pearson Education, 2008. Text.