Cita APA

Porter,, M. E. (1980). Competitive Strategy: Techniques for analysing industries and competitors (1st.). Free Press.

Chicago Edition Citation

Porter,, Michael E. Competitive Strategy: Techniques for Analysing Industries and Competitors. 1st. New York: Free Press, 1980.

Cita MLA

Porter,, Michael E. Competitive Strategy: Techniques for Analysing Industries and Competitors. 1st. Free Press, 1980.