APA (7th ed.) Citation

Porter Michael E. (1980). Competitve Strategy: Techniques for Analyzing Industries and Competitors. Free Press.

Chicago Style (17th ed.) Citation

Porter Michael E. Competitve Strategy: Techniques for Analyzing Industries and Competitors. New York: Free Press, 1980.

MLA (9th ed.) Citation

Porter Michael E. Competitve Strategy: Techniques for Analyzing Industries and Competitors. Free Press, 1980.