Bibliography:Number


 * Conant, Levi Leonard. The Number Concept: Its Origin and Development (1896), 218 pp. online edition
 * Sarton, George. "Decimal Systems Early and Late," Osiris, Vol. 9. (1950), pp. 581-601. in JSTOR
 * Smith, David Eugene, and Louis Charles Karpinski. The Hindu-Arabic Numerals, (1911) 160pp online edition
 * Fernando Q. Gouvêa, "From numbers to number systems." Sect. II.1 (pp. 77—83) in: "The Princeton Companion to Mathematics", Timothy Govers (ed.), Princeton Univ. Press, 2008. Google book. (A not quite final version available to download, free.)