Theodore Roosevelt, Eugene Thwing (1919). “Newer Roosevelt messages: speeches, letters and magazine articles dealing with the war, before and after, and other vital topics”
Theodore Roosevelt (2015). “Theodore Roosevelt on Bravery: Lessons from the Most Courageous Leader of the Twentieth Century”, p.31, Skyhorse Publishing, Inc.
Theodore Roosevelt (2015). “Theodore Roosevelt on Bravery: Lessons from the Most Courageous Leader of the Twentieth Century”, p.76, Skyhorse Publishing, Inc.