Cita APA (7th ed.)

Porter, M. (2004). Competitive Advantage (1st.). Free Press.

Cita Chicago (17th ed.)

Porter, Michael. Competitive Advantage. 1st. Free Press, 2004.

Cita MLA (9th ed.)

Porter, Michael. Competitive Advantage. 1st. Free Press, 2004.

Atenció: Aquestes cites poden no estar 100% correctes.