Barack Obama (2009). “The Inaugural Address, 2009: Together with Abraham Lincoln's First and Second Inaugural Addresses and The Gettysburg Address and Ralph Waldo Emerson's Self-Reliance”, p.14, Penguin
Theodore Roosevelt's address to the nation (March 4, 1905), as quoted in "Ten Memorable Inaugural Addresses", www.realclearpolitics.com. January 16, 2013.