APA استشهاد

Singh, P. P. K. (2009). Customer relationship management (CRM).

استشهاد بنمط شيكاغو

Singh, P P; Kumar. Customer Relationship Management (CRM). Regal Publications, New Delhi, 2009.

MLA استشهاد

Singh, P P; Kumar. Customer Relationship Management (CRM). 2009.