Παραπομπή APA

Porter, M. E. (1998). Competitive strategy: Techniques for analyzing industries and competitors. New York: The Free Press.

Παραπομπή Chicago Style

Porter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York: The Free Press, 1998.

Παραπομπή MLA

Porter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York: The Free Press, 1998.

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