VERNON-WORTZEL, H. (1991). Global Strategic Management: The Essentials. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)VERNON-WORTZEL, Heidi. Global Strategic Management: The Essentials. John Wiley & Sons, 1991.
Lua MLA (8ú heag.)VERNON-WORTZEL, Heidi. Global Strategic Management: The Essentials. John Wiley & Sons, 1991.
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