Galilei, Galileo (1989). Translated and prefaced by Albert Van Helden (ed.). Sidereus Nuncius. Chicago & London: University of Chicago Press. pp. 14–16. ISBN978-0-226-27903-9.
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translation and edition by Denis Mahon in his Studies in Seicento Art and Theory (London, 1947); on Mahon, see Finaldi and Kitson, 15–16, and [1]. There is a long extract, with an introduction here, pp. 24–30
