1. History of Western Philosophy;Russell,1961
2. Discorsi e Dimostrazioni Matematiche intorno à Due Nuove Scienze;Galileo,1638
3. Philosophiae Naturalis Principia Mathematica;Newton,1687
4. The Meaning of Relativity;Einstein,1946
5. Continuities and discontinuities in Planck's Akt der Verzweiflung