"History of the World in Epitome (For Use in Martian Infant Schools)". Book by Bertrand Russell, as quoted in Slater Bertrand Russell (1994), p. 136, 1959.
Bertrand Russell, Ray Perkins (Jr.) (2002). “Yours Faithfully, Bertrand Russell: A Lifelong Fight for Peace, Justice, and Truth in Letters to the Editor”, p.411, Open Court Publishing