المراجع الأجنبية:

- Nicholson. R. A Studies in Islamic Mysticism. Combridge ١٩٦١.

- Spencer Trimingham. T. The sufi Orders of Islam. Oxford ١٩٧١.

- Arberry. A.J. An Introduction to the History of Sufism. Oxford ١٩٤٢.

- Nicholson: Literary History of the Arabs.

- Macdonald: Development of Moslem Theology.

- Sufism: An Account of the Mystics of Islam، London ١٩٥٦.

- Fazlur Rahman: Islam، London ١٩٦٦.

- Encyclopedia of Religion and Ethics ١٩٠٨. the Articles: Soul-Pantheism sufis.

- Encyclopedia of Islam the New Edition the Articles: Al-Hallja-ibn-Arabi Al-Bistami-Asceticism.