Calvin, R. J. (2007). Sales management demystified: A Self-Teaching Guide. New York, NY: McGraw-Hill.
Παραπομπή Chicago StyleCalvin, Robert J. Sales Management Demystified: A Self-Teaching Guide. New York, NY: McGraw-Hill, 2007.
Παραπομπή MLACalvin, Robert J. Sales Management Demystified: A Self-Teaching Guide. New York, NY: McGraw-Hill, 2007.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.