Martin Strong, John Arbuthnot (1745). “An Essay on the Usefulness of Mathematical Learning: In a Letter from a Gentleman in the City, to His Friend at Oxford”, p.8
"Gaither's Dictionary of Scientific Quotations" edited by Carl C. Gaither, Alma E. Cavazos-Gaither, Springer Science & Business Media, (p. 863), January 5, 2012.