Maymand, Mohammad Mahmoudi, Ali Kazemi, and Nazanin Sadat Fatehi. 2017. “Study of Effective Relationship Marketing on Service Quality Provided and Loyalty Customers (Case Study: Tehran Shahrvand Chain Stores)”. International Review of Management and Marketing 7 (3):165-70. https://econjournals.com./index.php/irmm/article/view/4957.