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
Poe, Roy W.
The McGraw-Hill handbook of business letters
McGraw-Hill, 1988
 Buku Teks
Gibaldi, Joseph
MLA handbook for writers of research papers
The Modern Language Association, 2003
 Buku Teks
Poe, Roy W.
The McGraw-Hill handbook of business letters
McGraw-Hill, 1994
 Buku Referensi