Epistles of the Brethren of Purity. On Arithmetic and geometry: An Arabic Critical Edition and English Translation of EPISTLES 1 & 2 By Nader El-Bizri, ed. and trans. (Oxford, NY: Oxford University Press in association with the Institute of Ismaili Studies, 2012. 400 pages.). (2014). American Journal of Islam and Society, 31(1), 116-120. https://doi.org/10.35632/ajis.v31i1.1027