1. QED The Strange Theory of Light and Matter;Feynman,1985
2. ‘Isaac Newton’s Papers and Letters on Natural Philosophy’, Harvard University Press, Cambridge, MA, 1958. See also I.B. Cohen, R.S. Westfall, Newton, W.W. Norton Company, New York, 1995, pp. 181–184.
3. The Feynman Lectures in Physics;Feynman,1963
4. Ref. [3], Section 26-6.
5. Ref. [3], vol 1. Chapter 37, vol. 2, Section 15-3, vol. 3 Chapter 3.