Grossman, Julius, author
Professional selling techniques
Allyn and Bacon, 1991
 Buku Referensi
Shinn, George
Introduction to professional selling / George Shinn
Gregg Division, McGraw-Hill, 1982
 Buku Teks
Eccher, Clint, author
Professional web design : techniques and templates
Charles River Media, 2002
 Buku Teks
Bacon, Terry R., 1947-
Selling to major accounts: tools, techniques, and practical solutions for the sales manager
[American Management Association;, ], 1999
 eBooks
Robeson, James F., author
Selling
Richard D. Irwin , 1978
 Buku Teks
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