SINGH M.K. (1989). ENVIRONMENTAL CHANGES AND DEVELOPMENT. CHUGH PUBLICATIONS.
शिकागो स्टाइल उद्धरणSINGH M.K. ENVIRONMENTAL CHANGES AND DEVELOPMENT. ALLAHABAD: CHUGH PUBLICATIONS, 1989.
एमएलए उद्धरणSINGH M.K. ENVIRONMENTAL CHANGES AND DEVELOPMENT. CHUGH PUBLICATIONS, 1989.
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