Al-Hussainawi, Dr. Abdul Redha Hassan Jiyad. “Historical Factors for the Emergence of Ascetic Schools in the Islamic East: And Their Impact on the Emergence of Sufism”. Journal of Jurisprudence Faculty, vol. 1, no. 4, June 2007, pp. 263-85, https://doi.org/10.36324/fqhj.vi4.8369.