APA (7 वां संस्करण) प्रशस्ति पत्र

Harvard Business School. (2011). Increasing Customer Loyalty. Harvard Business.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Harvard Business School. Increasing Customer Loyalty. Boston: Harvard Business, 2011.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Harvard Business School. Increasing Customer Loyalty. Harvard Business, 2011.