Bowman, Joel P., author
Effective business correspondence
Harper & Row Publishers, 1979
 Buku Referensi
Siswanto Sutojo, author
Komunikasi bisnis yang efektif : effective business communications
Damar Mulia Pustaka, 2003
 Buku Teks
Keenan, John
Feel free to write : guide for business and professional people / John Keenan
John Wiley & Sons, 1982
 Buku Teks
Wilson, Kevin, author
AMA handbook of business writing: the ultimate guide to style, grammar, usage, punctuation, construction, and formatting
American Management Association, 2010
 eBooks
Webster's guide to business correspondence
Merriam-Webster, Inc., 1988
 Buku Teks
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