Cunningham, W. P., & Cunningham, M. A. 1. 1. (2012). Environmental science: A global concern (Twelfth ed.). New York: McGraw-Hill Companies, Inc.
Trích dẫn kiểu ChicagoCunningham, William P., và Mary Ann. 1963- 1945- Cunningham. Environmental Science: A Global Concern. Twelfth ed. New York: McGraw-Hill Companies, Inc, 2012.
Deismireacht MLACunningham, William P., và Mary Ann. 1963- 1945- Cunningham. Environmental Science: A Global Concern. Twelfth ed. New York: McGraw-Hill Companies, Inc, 2012.
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