Cunningham, W. P., & Cunningham, M. A. (2004). Principles of environmental science: Inquiry and applications (2nd ed.). McGraw-Hill Companies, Inc.
Citace podle Chicago (17th ed.)Cunningham, William P., a Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 2nd ed. New York: McGraw-Hill Companies, Inc, 2004.
Citace podle MLA (9th ed.)Cunningham, William P., a Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 2nd ed. McGraw-Hill Companies, Inc, 2004.
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