Schiffman, Stephan. Secrets of selling services: everything you need to sell what your customer can't see - from pitch to close. New York: McGraw-Hill, ©2013. xiv, 226 s.
Schiffman, S. (2013). Secrets of selling services: Everything you need to sell what your customer can't see - from pitch to close. New York: McGraw-Hill.
Styl ChicagoSchiffman, Stephan. Secrets of Selling Services: Everything You Need to Sell What Your Customer Can't See - From Pitch to Close. New York: McGraw-Hill, 2013.
Citace podle MLASchiffman, Stephan. Secrets of Selling Services: Everything You Need to Sell What Your Customer Can't See - From Pitch to Close. New York: McGraw-Hill, 2013.
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