Cita APA (7th ed.)

Hamblin, W. K., & Howard, J. D. (2005). Excercises in Physical Geology (twelfth edition.). Pearson Pentrice Hall Inc..

Cita Chicago (17th ed.)

Hamblin, William Kenneth, i James D. Howard. Excercises in Physical Geology. twelfth edition. Upper Saddle River, NJ., USA: Pearson Pentrice Hall Inc., 2005.

Cita MLA (9th ed.)

Hamblin, William Kenneth, i James D. Howard. Excercises in Physical Geology. twelfth edition. Pearson Pentrice Hall Inc., 2005.