Safitri, R., Sulastri, and I. Andriana. “The Influence of Operational Costs on Operating Income and Interest Rates on Non-Performing Loans in Banking Companies Listed on Thei Indonesian Stock Exchange”. Ilomata International Journal of Tax and Accounting, Vol. 4, no. 4, Oct. 2023, pp. 771-8, doi:10.52728/ijtc.v4i4.909.