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| | Numerals, Numeration, and Numerical Notation Bibliography |
 | | Heath, Thomas L. A History of Greek Mathematics. |
 | | Kaufman, E.L., Lord, M.W., Reese, T.W., and Volkmann, J. The discrimination of visual number. |
 | | Thomas Luffkin of Colchester to Dr. Wallis, Concerning the Use of the Numeral Figures in England, as Old as the Year 1090. |
| www.phrontistery.info /nnsbib.html (8619 words) |
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