Gaya APA
Khalid, K, M. (2013).
Biografi Khalifah Rasulullah : Abu Bakar, Umar, Ustman,Ali & Umar Bin Abdul Aziz .
Jakarta:
Ummul Qura.
Gaya MLA
Khalid, Khalid, Muhammad.
"Biografi Khalifah Rasulullah : Abu Bakar, Umar, Ustman,Ali & Umar Bin Abdul Aziz".
Jakarta:
Ummul Qura,
2013.
Text.