Cunningham, W. P. (2005). Environmental science: A global concern. Boston, MA: McGraw-Hill Higher Education.
शिकागो स्टाइल उद्धरणCunningham, William P. Environmental Science: A Global Concern. Boston, MA: McGraw-Hill Higher Education, 2005.
एमएलए उद्धरणCunningham, William P. Environmental Science: A Global Concern. Boston, MA: McGraw-Hill Higher Education, 2005.
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