@book{17093,
	author = {Siraj Ad-Din, Abu Bakr and Siraj Ad-Din, Abu Bakr},
	title = {Book of Certainty, Sufi Doctrine of Faith, Vision and Gnosis},
	publisher = {Islamic Texts Society},
	year = {1992},
	address = {Cambridge},
	note = {includes index and biblioraphy}
}