Hamad, Abdul Fattah Rajab. “The Revolutions in Egypt and the Levant During the Abbasid Caliphate, 198-218 AH 813-833 AD”. Al-Mukhtar Journal of Social Sciences, vol. 15, no. 1, Dec. 2011, pp. 61-69, https://doi.org/10.54172/ajhnep14.