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John Adams, Charles Francis Adams (1856). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.45
Mary McLeod Bethune, Audrey Thomas McCluskey, Elaine M. Smith (2001). “Mary McLeod Bethune: Building a Better World : Essays and Selected Documents”, p.23, Indiana University Press
George W. Bush's address on War on Terror and Upcoming Iraqi Elections in Philadelphia, Pennsylvania, georgewbush-whitehouse.archives.gov. December 12, 2005.