Locker, Kitty O.
Business communication : building critical skills
McGraw-Hill, 2004
 Buku Teks
Brusino, Justin
Control that email!: business skills
American Society for Training & Development, 2007
 eBooks
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