Heath, P., & Avicenna. (1992). Allegory and philosophy in Avicenna (Ibn Sînâ): With a translation of the Book of the Prophet Muhammad's ascent to heaven. University of Pennsylvania Press.

Heath, Peter, and Avicenna. Allegory and Philosophy in Avicenna (Ibn Sînâ): With a Translation of the Book of the Prophet Muhammad's Ascent to Heaven. Philadelphia: University of Pennsylvania Press, 1992.

Heath, Peter, and Avicenna. Allegory and Philosophy in Avicenna (Ibn Sînâ): With a Translation of the Book of the Prophet Muhammad's Ascent to Heaven. University of Pennsylvania Press, 1992.