Introduction to Arithmetic
- Link page (DJVU, PDF available) at Archive.org (Translated by Martin Luther D'ooge)
- HTML excerpt from book 1 (Single page, 17 KB) at Xavier University (Translated by Martin Luther D'Ooge)
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- Hardcover edition of GBWW Vol. 11 (which includes this work), out of print (8 used copies available as of 7/28/2019) (Encyclopaedia Britannica, 1952).
All links verified on or after July 28, 2019