APA (7th ed.) Zitazioa

Porter, M. E. (1998). Competitive advantage: Creating and sustaining superior performance : with a new introduction. Free Press.

Chicago Style (17th ed.) Zitazioa

Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance : With a New Introduction. New York: Free Press, 1998.

MLA (9th ed.) Zitazioa

Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance : With a New Introduction. Free Press, 1998.