'Umdat al-tahqiq fi basha'ir All al-Sadiq - al-'Ubaydi, Ibrahim bin'Amir al-'Amiri; Ibn Balaban,'Ali, 1215 or 16-1285.; al-Suyuti, 1445-1505.; Ibn Khan, Siddiq ibn'Umar. (Beirut : Dar al-Kutub al-'Ilmiyah, 2010)
Keywords: Abu Bakr, -- Caliph, -- d. 634