APA Citation

 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 Citation

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

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