Cita APA

 Anderson, D. (2007).  How to deal with difficult customers: 10 simple strategies for selling to the stubborn, obnoxious, and belligerent.  John Wiley & Sons.

Chicago Style Citation

 Anderson, Dave.  How to Deal With Difficult Customers: 10 Simple Strategies for Selling to the Stubborn, Obnoxious, and Belligerent.  John Wiley & Sons, 2007.

Cita MLA

 Anderson, Dave.  How to Deal With Difficult Customers: 10 Simple Strategies for Selling to the Stubborn, Obnoxious, and Belligerent.  John Wiley & Sons, 2007.