al_Akkad, A. M. (1978). Kecemerlangan khalifah Umar bin Khattab. Bulan Bintang.
Chicago Style Citational_Akkad, Abbas Mahmoud. Kecemerlangan Khalifah Umar Bin Khattab. Bulan Bintang, 1978.
MLA Citational_Akkad, Abbas Mahmoud. Kecemerlangan Khalifah Umar Bin Khattab. Bulan Bintang, 1978.
Warning: These citations may not always be 100% accurate.