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.