Gaya APA
The Secret of Istighfar. (2009).
Jakarta:
Gema Insani.
Gaya Chicago
The Secret of Istighfar.
.
Jakarta:
Gema Insani,
2009.
Text.
Gaya MLA
The Secret of Istighfar.
.
Jakarta:
Gema Insani,
2009.
Text.
Gaya Turabian
The Secret of Istighfar.
Jakarta:
Gema Insani,
2009.
Print.