Masoud, R. S., Asmuliadi bin Lubis, and K. Nordin. “ضوابط اللإختيار والتعيين في العصرين اللأموي والعباسي: Control and Selection Controls in the Umayyad and Abbasid Periods”. Al-Muqaddimah: Online Journal of Islamic History and Civilization, vol. 7, no. 2, June 2020, pp. 66-74, https://sare.um.edu.my/index.php/MUQADDIMAH/article/view/24314.