Cita APA (7a ed.)

Porter, M. E. (1990). The competitive advantage of nations (1st pub.). Macmillan Press.

Cita Chicago Style (17a ed.)

Porter, Michael E. The Competitive Advantage of Nations. 1st pub. London [etc.]: Macmillan Press, 1990.

Cita MLA (9a ed.)

Porter, Michael E. The Competitive Advantage of Nations. 1st pub. Macmillan Press, 1990.