Maymand, Mohammad Mahmoudi, et al. “Study of Effective Relationship Marketing on Service Quality Provided and Loyalty Customers (Case Study: Tehran Shahrvand Chain Stores)”. International Review of Management and Marketing, vol. 7, no. 3, July 2017, pp. 165-70, https://econjournals.com.tr/index.php/irmm/article/view/4957.