APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.