David McCullough (2011). “David McCullough Great Moments in History E-book Box Set: 1776, The Johnstown Flood, Path Between the Seas, The Great Bridge, The Course of Human Events”, p.101, Simon and Schuster
David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.556, Simon and Schuster
David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.562, Simon and Schuster
David McCullough (2007). “Mornings on Horseback: The Story of an Extraordinary Faimly, a Vanished Way of Life and the Unique Child Who Became Theodore Roosevelt”, p.28, Simon and Schuster
David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.527, Simon and Schuster
David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.642, Simon and Schuster