Hahn, A. V. G. (1970). The petrochemical industry: Market and economics. New York: McGraw-Hill.
शिकागो स्टाइल उद्धरणHahn, Albert V. G. The Petrochemical Industry: Market and Economics. New York: McGraw-Hill, 1970.
एमएलए उद्धरणHahn, Albert V. G. The Petrochemical Industry: Market and Economics. New York: McGraw-Hill, 1970.
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