Umar Al-Khattab: Reformis dunia Islam. - Abdul Latip Talib (Kuala Lumpur: PTS Millennia, 2009)
Keywords: Muhammad, Prophet, d.632 - Companions; Islam -- Bahaism -- Theosophy; Muhammad, Prophet, d.632 - Friends and associates; Umar ibn al-Khattab - Caliph, 644; Muhammad, Prophet, d.632 - Friends and associates; Muhammad, Prophet, d.632 - Companions