Porter, M. E. (1980). Competitive strategy: Techniques for analyzing industries and competitors. New York ; London: Free Press.
Trích dẫn kiểu ChicagoPorter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York ; London: Free Press, 1980.
Deismireacht MLAPorter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York ; London: Free Press, 1980.
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