Anjum, T. “ ’Osmān Sayyid Ahmad Ismā’īl Al-Bīlī . Prelude to the Generals: A Study of Some Aspects of the Reign of the Eighth ’Abbāsid Caliph, Al-Mu’taṣim Bi-Allah (218-277 AH/833-842 AD). ”. Islamic Studies, Vol. 41, no. 4, Dec. 2002, pp. 763-9, doi:10.52541/isiri.v41i4.5030.