Wilson, Kevin
AMA handbook of business writing: the ultimate guide to style, grammar, usage, punctuation, construction, and formatting
American Management Association, 2010
 eBooks
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
Seglin, Jeffrey L.
The AMA handbook of business letters
Amacom, 1996
 Buku Referensi
Beason, Larry
A Commonsense guide to grammar and usage
Bredfors/ St. Martins, 2003
 Buku Teks