Oster, S. M. (1994). Modern competitive analysis (2nd ed.). University press.
शिकागो स्टाइल उद्धरणOster, Sharon M. Modern Competitive Analysis. 2nd ed. New York: University press, 1994.
एमएलए उद्धरणOster, Sharon M. Modern Competitive Analysis. 2nd ed. University press, 1994.
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