Gaya APA

Kumar, V., Reinartz, W. (2006). Cutomer Relationship Management : Concept, Strategy, and Tools (Ed. 3). Jerman: Springer.

Gaya MLA

Kumar, V.., Reinartz, Werner. "Cutomer Relationship Management : Concept, Strategy, and Tools". Ed. 3 Jerman: Springer, 2006. Text.