Welsh, K. (2008). Happy about customer service?: Creating a culture of customer service excellence. HappyAbout.info.
Chicago-Zitierstil (17. Ausg.)Welsh, Ken. Happy About Customer Service?: Creating a Culture of Customer Service Excellence. Cupertion, CA: HappyAbout.info, 2008.
MLA-Zitierstil (9. Ausg.)Welsh, Ken. Happy About Customer Service?: Creating a Culture of Customer Service Excellence. HappyAbout.info, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.