Merriam-Webster's guide to business correspondence : a merriam-webster
Merriam-Webster's, Incorporated, 1993
 Buku Referensi
Munter, Mary
Guide to managerial communication: effective business writing and speaking
Prentice-Hall, 1982
 Buku Referensi
Ewald, Helen Rothschild
Business communication
Prentice-Hall International, 1997
 Buku Teks
Locker, Kitty O.
Business and administrative communication
McGraw-Hill/Irwin, 2000
 Buku Teks
Neher, William W.
The business and profesional communicator
Allyn and Bacon, 1993
 Buku Teks