Khulafa' Rasyidun dan daulah Islamiah : Abu Bakar As-Siddiq,Umar Al-Khattab,Uthman Ibn Affan,Ali Ibn Talib - MOHD Rashad Shamsudin M.D. (Kuala Lumpur : Al-Hidayah Publishers, 2000)
Keywords: Abu Bakar,Caliph, d. 634; Ali Ibn Talib,Calips, d.661; Umar Al-Khattab,Calips, d.644; Uthman Ibn Affan,Calips, d.656