Porter, M. E. (1990). The competitive advantage of nations. Free Press.
Lua i Stíl Chicago (17ú heag.)Porter, Michael E. The Competitive Advantage of Nations. New York: Free Press, 1990.
Lua MLA (9ú heag.)Porter, Michael E. The Competitive Advantage of Nations. Free Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.