एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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