Παραπομπή APA
Porter, M. E. (1998). Competitive advantage: Creating and sustaining superior performance. New York: Free Press.
Παραπομπή Chicago StylePorter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. New York: Free Press, 1998.
Παραπομπή MLAPorter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. New York: Free Press, 1998.
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