Cita APA (7a ed.)

Porter, M. E. (1998). Competitive strategy: Techniques for analyzing industries and competitors ; with a new introduction. The Free Press.

Cita Chicago Style (17a ed.)

Porter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors ; with a New Introduction. The Free Press, 1998.

Cita MLA (8a ed.)

Porter, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors ; with a New Introduction. The Free Press, 1998.