Estrada, Rafael R.
Sales and Bilments
Central Book Supply,Inc., 1973
 Buku Teks
Still, Richard R
Sales management
Prentice Hall International, 1988
 Buku Teks
Ohai, Tim, author
Sales coaching
American Society for Training & Development, 2008
 eBooks
Battersby, Albert, author
Sales forecasting
Penguin Books, 1968
 Buku Teks
Sugars, Bradley J., author
Instant sales
McGraw-HIll , 2006
 Buku Teks
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