CUNNINGHAM, W. P. (2004). Principles of environmental science: Inquiry and applications. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCUNNINGHAM, William P. Principles of Environmental Science: Inquiry and Applications. McGraw-Hill, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCUNNINGHAM, William P. Principles of Environmental Science: Inquiry and Applications. McGraw-Hill, 2004.
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