Grossman, Julius, author
Professional selling techniques
Allyn and Bacon, 1991
 Buku Referensi
The Professional secretary's Handbook
Boston: Houghton: 1993,
 Buku Referensi
Professional psychology : research and practice
American Psychological Association, {s.a}
 Majalah, Jurnal, Buletin
Hinkle, Deborah A.
Word : a professional approach 2002
MCGraw-Hill , 2002
 Multimedia
Microsoft visual studio.net professional
Microsoft Corporation, 1985-2001
 Multimedia
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