Armanto, R., A. Rasjid, and M. Gunarto. “Building Banking Customer Loyalty: The Roles of Product Quality, Customer Service, Operational Excellence, and Work Environment”. Jurnal Nasional Manajemen Pemasaran Dan SDM, vol. 7, no. 2, June 2026, pp. 234 -3, doi:10.47747/jnmpsdm.v7i2.3532.