Serena J. Dyer, Wayne W. Dyer (2014). “Don’t Die with Your Music Still in You: My Experience Growing Up with Spiritual Parents: My Experience Growing Up with Spiritual Parents”, p.179, Hay House, Inc
Albert Einstein's speech made in honor of Thomas Mann, when Mann was given the Einstein Prize given by the Jewish Forum (January 1939), as quoted in Abraham Pais "Einstein Lived Here" (p. 214), 1994.