1. Equivalence and Priority: Newton versus Leibniz;Bertoloni Meli,1993
2. Newton's unpublished dynamical principles: A study in simplicity;Brackenridge;Annals of Science,1990
3. The Key to Newton's Dynamics: The Kepler Problem and the Principia;Brackenridge,1995
4. Newton's Principia for the Common Reader;Chandrasekhar,1995
5. Introduction to Newton's Principia;Cohen,1971