William Shakespeare (1793). “The Plays of William Shakspeare: In Fifteen Volumes. With the Corrections and Illustrations of Various Commentators. To which are Added, Notes by Samuel Johnson and George Steevens. The Fourth Edition. Revised and Augmented (with a Glossarial Index) by the Editor of Dodsley's Collection of Old Plays”, p.277
State Department press conference on April 21, 1961. "A Thousand Days: John F. Kennedy in the White House". Book by Arthur M. Schlesinger Jr., p. 262, 1965.