APA-referens (7:e uppl.)

Keller, E. A. (1996). Environmental geology (7th ed.). Prentice Hall.

Chicago-referens (17:e uppl.)

Keller, Edward A. Environmental Geology. 7th ed. New Jersey: Prentice Hall, 1996.

MLA-referens (9:e uppl.)

Keller, Edward A. Environmental Geology. 7th ed. Prentice Hall, 1996.