Khulafa' Rasyidun & daulah Islamiah : Abu Bakar as-Siddiq'Umar al- Khattab Uthman ibn Affan Ali ibn Abi Talib - Mohd. Rashad Shamsuddin, Haji. (Kuala Lumpur : Al-Hidayah Publishers, 2000)
Bibliography : p. 479-481.
Keywords: Caliphs -- Biography; Caliphate; Islamic Empire -- History; Arab countries -- History