"Where Doubt Is Faith and the Sign Is Spirit: Sarah Charlesworth’s Art of Personal Religion" by G. Roger Denson, www.huffingtonpost.com. September 8, 2015.
"John F. Kennedy: 1961 : containing the public messages, speeches, and statements of the president, January 20 to December 31, 1961" by John F. Kennedy, Washington: Office of the Federal Register, National Archives and Records Service, General Services Administration, 1962.