"‘Ides Of March’ Screenwriter Beau Willimon Talks Political Vs. Oscar Campaigns & Why George Clooney Deserved More Oscar Nods". Interview with Kevin Jagernauth, www.indiewire.com. February 25, 2012.
Benjamin Franklin, Ulysses S Grant, Andrew Carnegie, Henry Adams (2016). “Great American Lives: The Autobiography of Benjamin Franklin, Personal Memoirs of Ulysses S. Grant, Autobiography of Andrew Carnegie, and The Education of Henry Adams”, p.1343, Open Road Media
Sarah-Patton Boyle, Jennifer Lynn Ritterhouse (1962). “The Desegregated Heart: A Virginian's Stand in Time of Transition”, p.169, University of Virginia Press
"Werner Herzog's Cave Painting Documentary 'The Birth of the Modern Human Soul'". Interview with David Gordon Smith, www.spiegel.de. February 16, 2011.