APA (7th ed.) Citation

Keller, E. A. (1993). Environmental geology (6. ed., 3. print.). Macmillan u.a.

Chicago Style (17th ed.) Citation

Keller, Edward A. Environmental Geology. 6. ed., 3. print. New York u.a: Macmillan u.a, 1993.

MLA (9th ed.) Citation

Keller, Edward A. Environmental Geology. 6. ed., 3. print. Macmillan u.a, 1993.