David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.515, Simon and Schuster
David McCullough (2011). “David McCullough American History E-book Box Set: John Adams, 1776, Truman, The Course of Human Events”, p.144, 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.527, 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