PORTER, M. E. (1980). Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press.
Lua i Stíl Chicago (17ú heag.)PORTER, Michael E. Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press, 1980.
Lua MLA (8ú heag.)PORTER, Michael E. Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press, 1980.
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