Porter, M. E. (2004). Competitive Advantage: Creating and Sustaining Superior Performance. Free Press.
Lua i Stíl Chicago (17ú heag.)Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. New York: Free Press, 2004.
Lua MLA (9ú heag.)Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. Free Press, 2004.
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