Kurian, George Thomas
The AMA dictionary of business and management
Amacom, 2013
 Buku Referensi
Statt, David A.
Concise dictionary of business management
Routledge, 1999
 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
Seglin, Jeffrey L.
The AMA handbook of business letters
Amacom, 1996
 Buku Referensi