Meyer, Harold E., author
Lifetime encyclopedia of letters
Prentice-Hall, 1992
 Buku Referensi
Seglin, Jeffrey L., author
The AMA handbook of business letters
Amacom, 1996
 Buku Referensi
Director's and officer's complete letter book
edited by L. Edward Purcell
Prentice-Hall, 1991
 Buku Referensi
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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