APA (7th ed.) Zitazioa

Porter, M. E. (1990). The competitive advantage of nations. Free Press.

Chicago Style (17th ed.) Zitazioa

Porter, Michael E. The Competitive Advantage of Nations. New York: Free Press, 1990.

MLA (9th ed.) Zitazioa

Porter, Michael E. The Competitive Advantage of Nations. Free Press, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.