Cita APA

Porter, M. E. 1., & Porter, M. E. 1. (1980). Competitive strategy: Techniques for analyzing industries and competitors. New York, New York: Free Press.

Citación estilo Chicago

Porter, Michael E. 1947-, y Michael E. 1947- Porter. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York, New York: Free Press, 1980.

Cita MLA

Porter, Michael E. 1947-, y Michael E. 1947- Porter. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York, New York: Free Press, 1980.