Cunningham, W. P. (2006). Principles of environmental science: Inquiry and applications. McGraw-Hill.
शिकागो स्टाइल उद्धरणCunningham, William P. Principles of Environmental Science: Inquiry and Applications. McGraw-Hill, 2006.
एमएलए उद्धरणCunningham, William P. Principles of Environmental Science: Inquiry and Applications. McGraw-Hill, 2006.
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