Walker,Hugh D. (1971). Market power and price levels in the ethical drug industry. Indiana University Press.
शिकागो स्टाइल उद्धरणWalker,Hugh D. Market Power and Price Levels in the Ethical Drug Industry. London: Indiana University Press, 1971.
एमएलए उद्धरणWalker,Hugh D. Market Power and Price Levels in the Ethical Drug Industry. Indiana University Press, 1971.
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