A. Wulandari, J. Wardi, and L. Wati, “Internal and External Factors of Non-performing Loan (NPL): A Study on the Economic Enterprise of Savings and Loans (UEK-SP) in Rumbai District, Pekanbaru, Riau in 2020-2022”, ICESS, vol. 2, pp. 814–835, Dec. 2024.