Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Buku Teks
Ewald, Helen Rothschild
Business communication
Prentice-Hall International, 1997
 Buku Teks
Dumont, Raymond A.
Business communications
Little, Brown, 1985
 Buku Teks
Krizan, A.C.
Business communication
Thomson, 2008
 Buku Teks
Ewald, Helen Rothschild
Business communication
Prentice-Hall International, 1997
 Buku Teks