Guffey, M. E. (2000). Business communication: Process and product (3rd ed.). Cincinnati: South-Western College.
Trích dẫn kiểu ChicagoGuffey, Mary Ellen. Business Communication: Process and Product. 3rd ed. Cincinnati: South-Western College, 2000.
MLA citiranjeGuffey, Mary Ellen. Business Communication: Process and Product. 3rd ed. Cincinnati: South-Western College, 2000.
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