Khalil, A. “The Comfort of the Mystics: A Manual and Anthology of Early Sufism By Gerhard Böwering and Bilal Orfali (Leiden: Brill, 2013. 34 (English) + 686 (Arabic) pages.)”. American Journal of Islam and Society, vol. 31, no. 3, July 2014, pp. 149-52, doi:10.35632/ajis.v31i3.1066.