APA (7th ed.) Citation

Lings. (1992). The book of certainty: The sufi doctrine of faith, vision and gnosis (Rev. expanded ed.). Islamic Texts Society.

Chicago Style (17th ed.) Citation

Lings. The Book of Certainty: The Sufi Doctrine of Faith, Vision and Gnosis. Rev. expanded ed. Cambridge: Islamic Texts Society, 1992.

MLA (9th ed.) Citation

Lings. The Book of Certainty: The Sufi Doctrine of Faith, Vision and Gnosis. Rev. expanded ed. Islamic Texts Society, 1992.