Dirasat fi tarikh al-khulafa' al-Rashidin - Batayinah, Muhammad Dayf Allah ('Amman : Imad al-Din, 2009)
Keywords: Abu Bakr, -- Caliph, -- d. 634; 'Umar ibn al-Khattab, -- Caliph, -- d. 644; 'Uthman ibn'Affan, -- Caliph, -- d. 656; 'Ali ibn Abi Talib, -- Caliph, -- 600 (ca.)-661; Caliphate -- History; Islamic Empire -- History -- 622-661