Locker, Kitty O., author
Business and administrative communication
Irwin, 1995
 Buku Referensi
Locker, Kitty O.
Business and administrative communication
McGraw-Hill, 2000
 Multimedia
Locker, Kitty O., author
Business and administrative communication / Kitty O. Locker.
Irwin Mcgraw-Hill, 2000
 Buku Teks
Ewald, Helen Rothschild
Business communication/ Rebecca E. Burnett
Prentice Hall International, 1997
 Buku Teks
Treece, Marla
Succesful communication for business sand the profession/ Malra Treece
Allyn and Bacon, 1994
 Buku Teks