Gaya APA

Tarbuck, E, J., Lutgens, F, K. (1993). The Earth An Introduction to Physical Geology Fourth Edition . New York: Macmillan Publishing Company.

Gaya MLA

Tarbuck, Edward, J.., Lutgens, Frederick, K.. "The Earth An Introduction to Physical Geology Fourth Edition". New York: Macmillan Publishing Company, 1993. Text.