APA aipamena

 Keller, E. A. (2011).  Environmental geology.  Pearson Prentice Hall.

Chicago Style aipamena

 Keller, Edward A.  Environmental Geology.  Pearson Prentice Hall, 2011.

MLA aipamena

 Keller, Edward A.  Environmental Geology.  Pearson Prentice Hall, 2011.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.