Cita APA

Porter, M. E. (1985). Competitive advantage. New York: The Free Press.

Chicago Style Citation

Porter, Michael E. Competitive Advantage. New York: The Free Press, 1985.

Cita MLA

Porter, Michael E. Competitive Advantage. New York: The Free Press, 1985.

Atenció: Aquestes cites poden no estar 100% correctes.