Lord Philip Dormer Stanhope Chesterfield, Philip Dormer Stanhope Earl of Chesterfield (1855). “The Works of Lord Chesterfield: Including His Letters to His Son, Etc : to which is Prefixed, an Original Life of the Author”, p.548
News conference in Washington, D.C., on October 05, 1956. "Public Papers of the Presidents of the United States: Dwight D. Eisenhower". Book by Dwight D. Eisenhower, p. 862, 1961.