Gaya APA
Abrurrahman, Z.
(2014).
Ilham Keberanian Umar bin Khatab
.
Yogyakarta:
Diva Press.
Gaya MLA
Abrurrahman, Zen.
"Ilham Keberanian Umar bin Khatab".
Yogyakarta:
Diva Press,
2014.
.