E. Hasibuan, D. P. Sari, and H. Ikhwana, “The Influence of Capital Adequacy Ratio (CAR), Non Performing Loan (NPL), Operating Costs to Operating Income (BOPO) on Liquidity as Measured by Loan to Deposit Ratio at HSBC Bank”, probis, vol. 11, no. 2, pp. 24–30, Oct. 2020.