- E-bookThe Hindu-Arabic NumeralsLouis Charles Karpinski
- E-bookThe Hindu-Arabic NumeralsDavid Eugene Smith
- E-bookThe Hindu-Arabic NumeralsLouis Charles Karpinski
- E-bookThe Hindu-Arabic NumeralsLouis Charles Karpinski
- E-bookSerie: Dover Books on MathematicsRobert Gilmore
- E-bookThe Hindu-Arabic NumeralsDavid Eugene Smith