Thill, John V., author
Excellence in Business Communication / John V. Thill, Courtland L. Bovee
McGraw-Hill, 1993
 Buku Teks
Thill, John V., author
Excellence in business communication/ John V. Thill, Courtland L. Bovee
McGraw-Hill, 1991
 Buku Teks
Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Buku Teks
Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Koleksi Publik
Ewald, Helen Rothschild
Business communication
Prentice Hall International, 1997
 Buku Teks
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