S. Muhammad, B., K. M. Abdullah, and I. M. Ali. “Estimation of the Production Function of Making Bricks and Their Efficiency for the Period 2014-2018”. TANMIYAT AL-RAFIDAIN, vol. 42, no. 139, Sept. 2023, pp. 132-51, doi:10.33899/tanra.2023.180479.1299.