Cunningham, W. P. (2004). Principles of Environmental Science: Inquiry and Applicaions. McGraw-Hill Higher Education, Boston.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCunningham, William P. Principles of Environmental Science: Inquiry and Applicaions. New York: McGraw-Hill Higher Education, Boston, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCunningham, William P. Principles of Environmental Science: Inquiry and Applicaions. McGraw-Hill Higher Education, Boston, 2004.
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