Gaya APA
Sri, B, M, S.
(1996).
Khalifah Umar bin Khattab
.
Bandung:
Rosdakarya Offset.
Gaya MLA
Sri, Bharata, MW,, Savitri.
"Khalifah Umar bin Khattab".
Bandung:
Rosdakarya Offset,
1996.
Printed Book.