Cita APA (7a ed.)

Keller, E. A. (2012). Introduction to environmental geology (5th ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Keller, Edward A. Introduction to Environmental Geology. 5th ed. Upper Saddle River, NJ: Prentice Hall, 2012.

Cita MLA (9a ed.)

Keller, Edward A. Introduction to Environmental Geology. 5th ed. Prentice Hall, 2012.