Guffey, Mary Ellen, author
Essentials of business communication
Cengage Learning, 2008
 Multimedia
Guffey, Mary Ellen, author
Essentials of business communication
PWS Publishing, 1991
 Buku Teks
Guffey, Mary Ellen, author
Essentials of business communication
PWS-Kent, 1988
 Buku Teks
Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Buku Teks
Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
 Koleksi Publik
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