Gaya APA

Khalid, K, M., Sugito, Y. (2013). Biografi Khalifah Rasulullah: Abu Bakar, Umar, Utsman Ali Dan Umar Bin Abdul Aziz (-). Jakarta: Ummul Qura.

Gaya MLA

Khalid, Khalid, Muhammad., Sugito, Yogi. "Biografi Khalifah Rasulullah: Abu Bakar, Umar, Utsman Ali Dan Umar Bin Abdul Aziz". - Jakarta: Ummul Qura, 2013. Text.