Cook, R. A., & Cook, G. O. (2011). Guide to business etiquette. Boston: Prentice Hall.
Trích dẫn kiểu ChicagoCook, Roy A., và Gwen O. Cook. Guide to Business Etiquette. Boston: Prentice Hall, 2011.
Deismireacht MLACook, Roy A., và Gwen O. Cook. Guide to Business Etiquette. Boston: Prentice Hall, 2011.
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