1. Jürgen Neffe, Einstein: A Biography (Baltimore: Johns Hopkins University Press, 2007), 126.
2. Clarence Streit, “Einstein Evolving Yet Another Theory,” The New York Times, July 27, 1930.
3. “Dr. Einstein Consults California Physicists,” The New York Times, January 4, 1931.
4. Peter Plesch and János Plesch, “Some Reminiscences of Albert Einstein,” Notes and Records of the Royal Society of London 49 (1995), 320.
5. Jeremy Bernstein, Albert Einstein and the Frontier of Physics (New York: Oxford University Press, 1996); Denis Brian, Einstein: A Life (New York: J. Wiley, 1996); Ronald Clark, Einstein: The Life and Times (New York: World Publishing Company, 1971); Albrecht Fölsing, Albert Einstein: A Biography (New York: Penguin Press, 1997); Walter Isaacson, Einstein: His Life and Universe (New York: Simon and Schuster, 2007); Jürgen Neffe, Einstein: A Biography; Abraham Pais, Subtle IS the Lord (New York: Oxford University Press, 2005).