Universidad Tecnológica de El Salvador

Ron Zemke

6 Book

Service Magic
The Art of Amazing Your Customers
Ron Zemke and Chip R. Bell
Kaplan Publishing, 2003
5 Book

Knock Your Socks Off Selling
Jeffrey Gitomer and Ron Zemke
AMACOM, 1999
7 Book

Service America
Doing Business in the New Economy
Karl Albrecht and Ron Zemke
McGraw-Hill, 1995