Callan, S. (1996). Environmental economics and managerment: Theory, policy, and applications. Chcago: Irwin.
शिकागो स्टाइल उद्धरणCallan, Scott. Environmental Economics and Managerment: Theory, Policy, and Applications. Chcago: Irwin, 1996.
एमएलए उद्धरणCallan, Scott. Environmental Economics and Managerment: Theory, Policy, and Applications. Chcago: Irwin, 1996.
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