APA (7th ed.) Citation

Keller, E. A. (1988). Environmental geology (5th ed.). Merrill.

Chicago Style (17th ed.) Citation

Keller, Edward A. Environmental Geology. 5th ed. Columbus, Ohio: Merrill, 1988.

MLA (9th ed.) Citation

Keller, Edward A. Environmental Geology. 5th ed. Merrill, 1988.