Adnan El-Anini, W. (2017). 'Caliph's social role in the era of early Islam and Umayyad era through (Jumal min insab Al-Ashraf) alashraf of ALbalathree book to Bladhire R.T:', Annals of the Faculty of Arts, Ain Shams University, 45(April - June (B)), pp. 73-111. doi: 10.21608/aafu.2017.16746