Al-Durgham, Lamees, and Mohammad Adeinat. “Assessing the Relative Efficiency for Listed Manufacturing Firms in Jordan Using Data Envelopment Analysis”. International Journal of Economics and Financial Issues, vol. 11, no. 1, Jan. 2021, pp. 135-9, https://econjournals.com.tr/index.php/ijefi/article/view/10919.