1. Galileo and His Sources;Wallace,1984
2. The Jesuits and Galileo's Ideas of Science and of Nature;Carugo;Annali dell'Istituto e Museo di Storia della Scienza di Firenze,1983
3. Sources of Galileo's Early Natural Philosophy;Crombie,1975
4. Galileo At Work;Drake,1978
5. Galileo On Motion and On Mechanics;Drabkin,1960