Sabir, R. I. ., M. . Irfan, M. A. . Sarwar, B. . Sarwar, and N. . Akhtar. “The Impact of Service Quality, Customer Satisfaction and Loyalty Programs on Customer’s Loyalty: An Evidence from Telecommunication Sector”. Journal of Asian Business Strategy, vol. 3, no. 11, Nov. 2013, pp. 306-14, https://archive.aessweb.com/index.php/5006/article/view/4111.