Gaya APA
Hamam, H, B, A, H.
(2010).
The Power of Istighfar
.
Yogyakarta:
Pustaka Marwa.
Gaya MLA
Hamam, Hasan, Bin, Ahmad, Hasan.
"The Power of Istighfar".
Yogyakarta:
Pustaka Marwa,
2010.
Text.