APA-viite

Singh, P., & Kumar, J. N. (2009). customer relationship management (CRM). Regal.

Chicago-tyylinen lähdeviittaus

Singh, P.P, ja Jinender N. Kumar. Customer Relationship Management (CRM). New Delhi: Regal, 2009.

MLA-viite

Singh, P.P, ja Jinender N. Kumar. Customer Relationship Management (CRM). Regal, 2009.