Rizvi, S.H. 2014. 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.). American Journal of Islam and Society. 31, 1 (Jan. 2014), 116–120. DOI:https://doi.org/10.35632/ajis.v31i1.1027.