Porter Michael. (2004). Competitive strategy: Techniques for analyzing industries and competttive. Free Press.
Citazione stile Chigago Style (17a edizione)Porter Michael. Competitive Strategy: Techniques for Analyzing Industries and Competttive. New York: Free Press, 2004.
Citatione MLA (9a ed.)Porter Michael. Competitive Strategy: Techniques for Analyzing Industries and Competttive. Free Press, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.