APA Style

Kumar, V., Reinartz, W. (2006). CustomerrnRelationship Management Concept, Strategy, and Tools (E-Book) . Germany: Springer-Verlag GmbH Germany.

MLA Style

Kumar, V.., Reinartz, Werner. "CustomerrnRelationship Management Concept, Strategy, and Tools (E-Book)". Germany: Springer-Verlag GmbH Germany, 2006. Text.