Moral principles
"Unto Others." The Wire, written by David Simon and William F. Zorzi and Ed Burns, directed by Anthony Hemingway, season 4, episode 7, Blown Deadline Productions and Home Box Office, 2006.
Twain, Mark. Following the Equator: A Journey Around the World. Hartford: American Publishing Company, 1897, ch. 38.
Twain, Mark. "Following the Equator." Mark Twain: A Tramp Abroad, Following the Equator, Other Travels, edited by Roy Blount Jr. Library of America, 2010, ch. 38.
Lincoln, Abraham. "Last Public Address." 11 Apr. 1865, White House, Washington, DC, USA.
Lincoln, Abraham. "Speech on Reconstruction, Washington, D.C., April 11, 1865." Abraham Lincoln: Speeches and Writings 1859-1865, edited by Don E. Fehrenbacher. Library of America, 1989.
Twain, Mark. "Extracts from Adam's Diary: Translated from the Original Ms." The Niagara Book. Buffalo: Underhill and Nichols, 1893.
Twain, Mark. "Extracts from Adam's Diary." The Best Short Stories of Mark Twain, edited by Lawrence Berkove. Modern Library, 2004.
Maugham, William Somerset. The Circle: A Comedy in Three Acts. 3 Mar. 1921, Haymarket Theatre, London, England, UK, act 3.
Maugham, William Somerset. The Circle: A Comedy in Three Acts. Cornell University Library, 2009, act 3.
Mr. Smith Goes to Washington. Directed by Frank Capra, Columbia Pictures, 1939.
Brecht, Bertolt. Die Dreigroschenoper [The Threepenny Opera]. 31 Aug. 1928, Theater am Schiffbauerdamm, Berlin, Germany, act 2, sc. 6.
Brecht, Bertolt. The Threepenny Opera. Grove Press, 1994, act 2, sc. 6.
Lincoln, Abraham. "Fragments: Notes for Speeches." c. Sep. 1859?
Lincoln, Abraham. "Notes for Speeches, c. September 1859." Abraham Lincoln: Speeches and Writings 1859-1865, edited by Don E. Fehrenbacher. Library of America, 1989.