Siti Hardiyanti Marpaung, Erlina, and Chandra Situmeang, “THE INFLUENCE OF CAPITAL ADEQUACY RATIO, NON-PERFORMING FINANCING, FINANCING TO DEPOSIT RATIO AND OPERATING EXPENSES TO OPERATING INCOME ON PROFITABILITY OF ISLAMIC BANKING IN INDONESIA”, IJEBAS, vol. 5, no. 1, pp. 34–44, Feb. 2025.