Archimedes of Syracuse – The Sand Reckoner, 3d century BC
translation: Thomas L. Heath – Introduction to the Works of Archimedes, 1897
copy from: James R. Newman – The World of Mathematics, vol.1, 1956
    part III. Arithmetic, Numbers and the Art of Counting, pp.418-429
    ©1956 Cambridge University Press, James R. Newman (no arrangement made)
discussion: Brian Clegg – Infinity, the quest to think the unthinkable, 2003
Novaloka – bigPsi, chapter 1.6. A small history of large numbers, 2011