APA Citation

 Duening, T. N. (2005).  Essentials of business process outsourcing.  John Wiley & Sons.

Chicago Style Citation

 Duening, Thomas N.  Essentials of Business Process Outsourcing.  John Wiley & Sons, 2005.

MLA Citation

 Duening, Thomas N.  Essentials of Business Process Outsourcing.  John Wiley & Sons, 2005.

Warning: These citations may not always be 100% accurate.