Ramadan Hassan, S. “The Scimtific and Administriue Effeneiency of the Ministey Awn-El-Din Bin-Hubara (499-560 A.H.)”. Adab Al-Rafidayn, vol. 42, no. 61, Jan. 2000, pp. 157-84, doi:10.33899/radab.2012.69362.