Gaya APA
Muhammad, Q, I.
(2002).
Kebijakan ekonomi Umar bin Khaththab
(
1)
.
Jakarta:
Pustaka Azzam.
Gaya MLA
Muhammad, Qutb, Ibrahim.
"Kebijakan ekonomi Umar bin Khaththab".
1
Jakarta:
Pustaka Azzam,
2002.
Text.