Gaya APA

Khalid, K, M. (2013). Biografi khalifah Rasulullah: Abu Bakar ash-Shiddiq, Umar bin al-Khattab, Utsman bin Affan, Ali bin Abi Thalib, dan Umar bin Abdul Aziz . : Ummul Qura.

Gaya MLA

Khalid, Khalid, Muhammad. "Biografi khalifah Rasulullah: Abu Bakar ash-Shiddiq, Umar bin al-Khattab, Utsman bin Affan, Ali bin Abi Thalib, dan Umar bin Abdul Aziz". : Ummul Qura, 2013. Buku Cetak.