C. Taofiqurrochman, P. . Rahayu, and L. P. . Hasyim, “The Effect of Non-Performing Loans (NPL) and Operational Costs to Operating Income (BOPO) on Core Capital with Return on Assets (ROA) as a Mediating Variable in Rural Banks (BPR) in the East Bekasi Region for the Period of 2019-2024”, Eduvest, vol. 6, no. 2, pp. 1787–1807, Feb. 2026.