Porter, M. E. (1998). The Competitive Advantage of Nations. Palgrave.
Chicago Style aipamenaPorter, Michael E. The Competitive Advantage of Nations. New York: Palgrave, 1998.
MLA aipamenaPorter, Michael E. The Competitive Advantage of Nations. Palgrave, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.