Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Buku Teks
Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Koleksi Publik
Locker, Kitty O.
Business communicatin
McGraw-Hill, 2007
 Buku Teks
Ewald, Helen Rothschild
Business communication
Prentice Hall International, 1997
 Buku Teks
Dumont, Raymond A.
Business communications
Little, Brown, 1985
 Buku Teks