Cita APA

 Cunningham, W. P. (2012).  Environmental science: A global concern.  McGraw-Hill Companies, Inc.

Chicago Style Citation

 Cunningham, William P.  Environmental Science: A Global Concern.  McGraw-Hill Companies, Inc, 2012.

Cita MLA

 Cunningham, William P.  Environmental Science: A Global Concern.  McGraw-Hill Companies, Inc, 2012.

Atenció: Aquestes cites poden no estar 100% correctes.