Dialogue on Motion. Composed by Galileo Galilei, Pisa, ca. 1590. Left unfinished and untitled. In: Mechanics in Sixteenth–Century Italy. Selections from Tartaglia, Benedetti, Guido Ubaldo, and Galileo. Translated and Annotated by Stillman Drake and I.E.Drabkin. Madison, Milwaukee and London, 1969, University of Wisconsin Press, 331–377, 332.