Gaya APA
Ash-Shalabi, A, M. et al
(2017).
Biografi Umar bin Khattab
.
Jakarta:
Ummul Qura.
Gaya MLA
Ash-Shalabi, Ali, Muhammad. et al.
"Biografi Umar bin Khattab".
Jakarta:
Ummul Qura,
2017.
Buku.