Cita APA (7a ed.)
Porter, M. E. (1980). Competitive strategy. The Free Press.
Cita Chicago Style (17a ed.)
Porter, Michael E. Competitive Strategy. London: The Free Press, 1980.
Cita MLA (9a ed.)
Porter, Michael E. Competitive Strategy. The Free Press, 1980.
Precaución: Estas citas no son 100% exactas.