H. Herlina, T. Anggraini, and M. S. A. Nasution, “The Effect of Enduring Service Intensifiers, Perceived Service Alternatives, and Self-Perceived Roles on the Level of Customer Satisfaction Using the Importance Performance Analysis Method (Case Study of Bank Sumut Syariah KC. Medan)”, IIJSE, vol. 8, no. 3, pp. 11382-11396, Oct. 2025.