Gaya APA

HAEKAL, M, H., Audah, A. (2009). UMAR BIN KHATTAB / Muhammad Husain Haikal (Cet.2). Jakarta: lentera antarnusa.

Gaya MLA

HAEKAL, Muhammad, Husain., Audah, Ali. "UMAR BIN KHATTAB / Muhammad Husain Haikal". Cet.2 Jakarta: lentera antarnusa, 2009. Text.