Quantum Mechanics - Symbolism of Atomic Measurements (2001) p. 24 f.
Julian Schwinger: Frases em inglês
as quoted by Sameer Shah in "If you can't join 'em, beat 'em": Julian Schwinger's Conflicts in Physics. Directions in Cultural History, The UCLA Historical Journal, Volume 21, 2005-2006, p. 50
Einstein's Legacy: The Unity of Space and Time (2002) p. 2