al-'Adalah al-'umariyah min sirah amir al-mu'minin'Umar ibn al-Khattab - Hijazi,'Ali Sa'ad'Ali (Beirut : Dar al-Kutub al-'Ilmiyah, 2009)
Keywords: 'Umar ibn al-Khattab, -- Caliph, -- d. 644; Caliphs -- Biography