Gaya APA
Haekal, M, H.
(2003).
Umar Bin Khattab
.
Bogor:
Pustaka Litera AntaraNusa.
Gaya MLA
Haekal, Muhammad, Husain.
"Umar Bin Khattab".
Bogor:
Pustaka Litera AntaraNusa,
2003.
Buku Tex.