1. F. Dyson, inSome Strangeness in the Proportion,edited by H. Woolf (Addison–Wesley, Reading, MA, 1980), p. 376.
2. Space-Time Approach to Non-Relativistic Quantum Mechanics
3. R. P. Feynman and A. R. Hibbs,Quantum Mechanics and Path Integrals(McGraw–Hill, New York, 1965).
4. R. P. Feynman,QED, The Strange Theory of Light and Matter(Princeton University Press, Princeton, 1985).
5. R. P. Feynman, R. B. Leighton, and M. Sands,The Feynman Lectures on Physics(Addison–Wesley, Reading, MA, 1964), Vol. III.