APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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