Gaya APA
Ruswandi, .
(2012).
Khalifah Umar Bin Khattab
(
Cet.1)
.
Jakarta:
Amzah.
Gaya MLA
Ruswandi, .
"Khalifah Umar Bin Khattab".
Cet.1
Jakarta:
Amzah,
2012.
Text.