Umar yang agung sejarah dan analisa kepemimpinan khalifah II - Shibli Numani, Muhammad, 1857-1914 (Bandung: Pustaka, 1981)
Original title:'Al Farooq, Life of Omar the Great, Second Caliph of Islam'
Keywords: 'Umar ibn al-Khattab, -- Caliph, -- d.644