Porter, M. E. (1990). The competitive advantage of nations. Macmillan.
Chicago Edition CitationPorter, Michael E. The Competitive Advantage of Nations. London: Macmillan, 1990.
Cita MLAPorter, Michael E. The Competitive Advantage of Nations. Macmillan, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.