al-Faruq :'Umar ibn al-Khattab thani al-Khulafa' al-rashidin radiya Allah'anhu Faruq : 'Umar ibn al-Khattab thani al-Khulafa' al-rashidin radiya Allah'anhu - Rida, Muhammad (Beirut : Dar al-Kutub al-'Ilmiyah, 1978)
Keywords: 'Umar ibn al-Khattab, -- Caliph, -- d. 644