Gaya APA
MUHAMMAD, Q, I., SHALEH, A, S.
(2002).
Kebijakan ekonomi Umar bin Khattab
.
Bali:
Pustaka Azzam.
Gaya MLA
MUHAMMAD, Quthb, Ibrahim., SHALEH, Ahmad, Syarifuddin.
"Kebijakan ekonomi Umar bin Khattab".
Bali:
Pustaka Azzam,
2002.
.