George Washington, Jared Sparks (1836). “The Writings of George Washington: Being His Correspondence, Addresses, Messages, and Other Papers, Official and Private, Selected and Published from the Original Manuscripts; with a Life of the Author, Notes and Illustrations”, p.40
Arlen Specter's remarks in a hearing on Congress's War Powers (January 30, 2007), as quoted in "Senate Republicans divided in dissent on Iraq", NBC News, January 30, 2007.