BARNEY JAY B. (2002). GAINING AND SUSTAINING COMPETITIVE ADVANTAGE 2 ED (2ND.). PEARSON EDUCATION.
Lua i Stíl Chicago (17ú heag.)BARNEY JAY B. GAINING AND SUSTAINING COMPETITIVE ADVANTAGE 2 ED. 2ND. NEW DELHI: PEARSON EDUCATION, 2002.
Lua MLA (9ú heag.)BARNEY JAY B. GAINING AND SUSTAINING COMPETITIVE ADVANTAGE 2 ED. 2ND. PEARSON EDUCATION, 2002.
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