Cæsar, Gaius Julius and Aulus Hirtius. Commentāriī dē Bellō Gallicō (Commentaries on the Gallic War), also Bellum Gallicum (Gallic War). 58/49 BC:

Edwards, H J, tr. Caesar: The Gallic War. Cambridge, Massachusetts: Harvard University Press, 1958 (1917).
https://archive.org/download/gallicwar00caes/gallicwar00caes.pdf

Greenough, James B, Benjamin L D’ooge, and M Grant Daniell, eds. Cæsar’s Gallic War. Boston: Ginn and Company, 1898.
https://archive.org/download/caesarsgallicwar00caes/caesarsgallicwar00caes.pdf