El-Husseini, Zain alabdin Aboud Kazem, and Ahmad N. Flaih. “Estimating Mediation and Direct Effects of the Multiple Model With Application Kidney”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 11, no. 4, Sept. 2019, pp. Stat Page 1-20, doi:10.29304/jqcm.2019.11.4.617.