APA ציטוט

 Enger Eldon D. (2010).  Environmental science: A study of interrelationships.  McGraw-Hill.

Trích dẫn kiểu Chicago

 Enger Eldon D.  Environmental Science: A Study of Interrelationships.  McGraw-Hill, 2010.

ציטוט MLA

 Enger Eldon D.  Environmental Science: A Study of Interrelationships.  McGraw-Hill, 2010.