Zaid, Sudirman. “The Role of Relationship Marketing to Building Loyalty on Bank Customers”. International Journal of Research in Business and Social Science (2147- 4478) 9, no. 3 (April 30, 2020): 26–33. Accessed March 28, 2024. https://www.ssbfnet.com/ojs/index.php/ijrbs/article/view/657.