Cita APA (7a ed.)

Keller, E. A. (1985). Environmental Geology (4th ed.). C.E. Merrill Pub. Co.

Cita Chicago Style (17a ed.)

Keller, Edward A. Environmental Geology. 4th ed. Columbus, Ohio: C.E. Merrill Pub. Co, 1985.

Cita MLA (9a ed.)

Keller, Edward A. Environmental Geology. 4th ed. C.E. Merrill Pub. Co, 1985.