هيكل، محمد حسين. (1999). Sejarah hidup Umar bin Al-Khattab. Pustaka Nasional.
Chicago Style (17th ed.) Citationهيكل، محمد حسين. Sejarah Hidup Umar Bin Al-Khattab. Singapura: Pustaka Nasional, 1999.
MLA (9th ed.) Citationهيكل، محمد حسين. Sejarah Hidup Umar Bin Al-Khattab. Pustaka Nasional, 1999.
Warning: These citations may not always be 100% accurate.