Gaya APA

Hammersley, D, H, C, C, C, P, &, L. (2010). Physical Geology : Earth Revealed (Ed 9). New York: The Mc Graw Hill.

Gaya MLA

Hammersley, Diane, H., Carlson,, Charles, C., Plummer, &, Lisa. "Physical Geology : Earth Revealed". Ed 9 New York: The Mc Graw Hill, 2010. Text.