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Manual on sales practices : how to improve the efficiency of your sales force
(1996)
Sales training : a guide to developing effective salespeople
Salisbury, Frank S., (1998)
Kundenorientiertes Verkaufsverhalten in Theorie und Praxis
Hofer, Franz J., (1984)
Developing negotiation skills in sales personnel : a guide to price realization for sales managers and sales trainers
Stumm, David A., (1987)
The new sales manager's survival guide
Stumm, David A., (1985)
Advanced industrial selling
Stumm, David A., (1981)