1. Ernst Mach,History and Root of the Principle of the Conservation of Energy (Transl. by P. E. P. Jourdain) (Open Court Publishing Company, Chicago, 1911), p. 39.
2. M. R. Cohen and I. E. Drabkin, ASource Book of Greek Science (McGraw-Hill, New York, 1948). See particularly the reference on p. 230 to the work of Hero of Alexandria,Mechanics II, 21?26.
3. Richard McKeon,The Basic Works of Aristotle (Random House, New York, 1941), p. 353.
4. Marshall Clagett,The Science of Mechanics in the Middle Ages (University of Wisconsin Press, Madison, 1959), p. 477.
5. P. Duhem,Les Origines de la Statique (Paris, 1905), Vol. 1, p. 177.