1. A study of the medieval illuminations of Peter of Eboli’s poem;C M Kauffman,1959
2. Solution Analyses Prior to Robert Boyle
3. Thorndike L (1934) A history of magic and experimental science, vol. III. Columbia University Press, Chapter XXIV, p 392, John de Dondis and Scientific Measurement
4. Thorndike L (1934) A history of magic and experimental science, vol. IV. Columbia University Press, Chapter XLVI, p 182 and 670, Michael Savonarola