Albert Einstein (2016). “The Albert Einstein Collection: Essays in Humanism, The Theory of Relativity, and The World As I See It”, p.40, Open Road Media
H.G. Wells (2015). “Annotated War of the Worlds with English Grammar Exercises: by H.G. Wells (Author), Robert Powell (Editor)”, p.222, Powell Publications, LLC
Speech to the Jersey City Chamber of Commerce (12 January 1938), as quoted in "The Last Three Miles : Politics, Murder, and the Construction of America's First Superhighway" by Steven Hart, (p. 137), 2007.