Bell, Joseph Norment. 1979. Love Theory in Later Hanbalite Islam. Studies in Islamic Philosophy and Science. Albany: State University of New York Press.
al-Daylamī, Abū ʼl-Ḥasan ʻAlī b. Muḥammad. 2005. A Treatise on Mystical Love. Translated by Joseph Norment Bell and Hassan Mahmoud Abdul Latif Al Shafie. Journal of Arabic and Islamic Studies. Monograph Series. Edinburgh: Edinburgh University Press.