Mohammed, S. H., and Z. S. Tawfiq. “Internal Causes of the Fall of the Emirates in The Islamic Mashreq During The 3rd And 4th A.H / 9th And 10th A.D Centuries”. Humanities Journal of University of Zakho, vol. 7, no. 3, Sept. 2019, pp. 295-08, doi:10.26436/hjuoz.2019.7.3.517.