Gaya APA

Haekal, M, H. (2009). Umar bin khattab / Muhammad Husain Haekal (Cet. 2). Bogor: Litera Antarnusa.

Gaya MLA

Haekal, Muhammad, Husain. "Umar bin khattab / Muhammad Husain Haekal". Cet. 2 Bogor: Litera Antarnusa, 2009. Text.