Peelen, E. (2005). Customer Relationship Management. Wiley India.
Dyfyniad Arddull ChicagoPeelen, Ed. Customer Relationship Management. New Delhi: Wiley India, 2005.
Dyfyniad MLAPeelen, Ed. Customer Relationship Management. Wiley India, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.