Seglin, Jeffrey L.
The AMA handbook of business letters
Amacom, 1996
 Buku Referensi
Webster's guide to business correspondence
Merriam-Webster, Inc., 1988
 Buku Teks
Merriam-Webster's guide to business correspondence : a merriam-webster
Merriam-Webster's, Incorporated, 1993
 Buku Referensi
Seglin, Jeffrey L.
The AMA handbook of business letters
[American Management Association, American Management Association], 2002
 eBooks
Seglin, Jeffrey L.
The AMA handbook of business letters
[American Management Association;;;, ], 2012
 eBooks