Cunningham, W. P. (2003). Environmental science: A global concern. Boston: McGraw-Hill.
शिकागो स्टाइल उद्धरणCunningham, William P. Environmental Science: A Global Concern. Boston: McGraw-Hill, 2003.
एमएलए उद्धरणCunningham, William P. Environmental Science: A Global Concern. Boston: McGraw-Hill, 2003.
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