Cita APA (7a ed.)

Porter, M. E. (1983). Cases in competitive strategy. Free Press Collier Macmillan.

Cita Chicago Style (17a ed.)

Porter, Michael E. Cases in Competitive Strategy. New York London: Free Press Collier Macmillan, 1983.

Cita MLA (9a ed.)

Porter, Michael E. Cases in Competitive Strategy. Free Press Collier Macmillan, 1983.