APA aipamena

Keller, E. A. (2008). Introduction to environmental geology (4th ed.). Pearson Prentice Hall.

Chicago Style aipamena

Keller, Edward A. Introduction to Environmental Geology. 4th ed. Upper Saddle River, N.J: Pearson Prentice Hall, 2008.

MLA aipamena

Keller, Edward A. Introduction to Environmental Geology. 4th ed. Pearson Prentice Hall, 2008.