ESPOL & Mena Villamar, C. S. (2011). The Importance of English in International Business.
Chicago Style (17. basım) AtıfESPOL ve Cindy Sofía Mena Villamar. The Importance of English in International Business. 2011.
MLA (9th ed.) AtıfESPOL ve Cindy Sofía Mena Villamar. The Importance of English in International Business. 2011.
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