Gaya APA
Haekal, Muhammad Husain. ().
Umar bin Khattab .
Yogyakarta:
.
Gaya Chicago
Haekal, Muhammad Husain.
Umar bin Khattab.
Yogyakarta:
,
.
Teks.
Gaya MLA
Haekal, Muhammad Husain.
Umar bin Khattab.
Yogyakarta:
,
.
Teks.
Gaya Turabian
Haekal, Muhammad Husain.
Umar bin Khattab.
Yogyakarta:
,
.
Teks.