APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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