APA (7th ed.) Citation

Keller, E. A. (1999). Introduction to environmental geology. Prentice Hall.

Chicago Style (17th ed.) Citation

Keller, Edward A. Introduction to Environmental Geology. Upper Saddle River, N.J: Prentice Hall, 1999.

MLA (9th ed.) Citation

Keller, Edward A. Introduction to Environmental Geology. Prentice Hall, 1999.