Gaya APA

Bakar, S, A, D, A. (1992). the Book of certainty: the sufi doctrine of faith, vision and gnosis / Abu Bakar Siraj ad Din ( Martin Lings ) . : The Islamic Texts Society.

Gaya MLA

Bakar, Siraj, Ad, Din,, Abu. "the Book of certainty: the sufi doctrine of faith, vision and gnosis / Abu Bakar Siraj ad Din ( Martin Lings )". : The Islamic Texts Society, 1992. Referensi.