Further Reading:
1999 Elias, Jamal Islam. "Religions of the World" Series. Upper Saddle River (NJ): Prentice Hall.

1997 Is'harc, Istafiah. Islam and Its Festivals. London: Ta-Ha Publishers.

1999 Tayob, Abdulkader. Islam: A Short Introduction. Oxford (UK):Oneworld.

1997 Ernst, Carl. The Shambhala Guide to Sufism. Boston: Shambhala.