Karl Popper, W.W. Bartley, III (2013). “Quantum Theory and the Schism in Physics: From the Postscript to The Logic of Scientific Discovery”, p.3, Routledge
George Washington, John Clement Fitzpatrick, David Maydole Matteson, United States George Washington Bicentennial Commission (1944). “The writings of George Washington from the original manuscript sources, 1745-1799: prepared under the direction of the United States George Washington bicentennial commission and published by authority of Congress”