Cita APA (7a ed.)

Keller, E. A. (1996). Environmental Geology (7a. ed.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Keller, Edward A. Environmental Geology. 7a. ed. New Jersey: Prentice-Hall, 1996.

Cita MLA (8a ed.)

Keller, Edward A. Environmental Geology. 7a. ed. Prentice-Hall, 1996.