PORTER MICHAEL. (2004). COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYZING INDUSTRIES AND COMPETITORS. THE FREE PRESS.
Citace podle Chicago (17th ed.)PORTER MICHAEL. COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYZING INDUSTRIES AND COMPETITORS. NEW YORK: THE FREE PRESS, 2004.
Citace podle MLA (9th ed.)PORTER MICHAEL. COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYZING INDUSTRIES AND COMPETITORS. THE FREE PRESS, 2004.
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