APA (7th ed.) Citation

Keller, E. A. (1992). Environmental geology (6th ed.). Macmillan.

Chicago Style (17th ed.) Citation

Keller, Edward A. Environmental Geology. 6th ed. New York: Macmillan, 1992.

MLA (9th ed.) Citation

Keller, Edward A. Environmental Geology. 6th ed. Macmillan, 1992.