Cita APA (7a ed.)

Keller, E. A. (1996). Environmental geology (7th ed.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Keller, Edward A. Environmental Geology. 7th ed. Upper Saddle River, N.J: Prentice-Hall, 1996.

Cita MLA (9a ed.)

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