Porter, M. E. (1990). The competitive advantage of nations. Free Press.
Chicago-čujuhus (17. p.)Porter, Michael E. The Competitive Advantage of Nations. New York: Free Press, 1990.
MLA-čujuhus (9. p.)Porter, Michael E. The Competitive Advantage of Nations. Free Press, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.