Porter, M. E. (1998). The competitive advantage of nations: With a new introduction. New York: Free Press.
Παραπομπή Chicago StylePorter, Michael E. The Competitive Advantage of Nations: With a New Introduction. New York: Free Press, 1998.
Παραπομπή MLAPorter, Michael E. The Competitive Advantage of Nations: With a New Introduction. New York: Free Press, 1998.
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