Muhammad Sadani, Prihatin Lumbanraja, and Meilita Tryana Sembiring, “EMPLOYEE PERFORMANCE IMPROVEMENT STRATEGY IN EFFORTS TO IMPROVE CUSTOMER RELATIONS USING HIERARCHY PROCESS ANALYSIS AND CUSTOMER RELATIONSHIP MANAGEMENT METHODS AT PT.MASAJI KARGOSENTRA TAMA BELAWAN”, IJERLAS, vol. 3, no. 5, pp. 1426–1435, Jun. 2023.