APA (7 वां संस्करण) प्रशस्ति पत्र

Kumar, V. (2013). Profitable Customer Engagement: Concepts, Metrics, and Strategies. SAGE Publications India Pvt. Ltd.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Kumar, V. Profitable Customer Engagement: Concepts, Metrics, and Strategies. New Delhi: SAGE Publications India Pvt. Ltd, 2013.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Kumar, V. Profitable Customer Engagement: Concepts, Metrics, and Strategies. SAGE Publications India Pvt. Ltd, 2013.