"'It Takes More Than That to Kill a Bull Moose': The Leader and The Cause". Theodore Roosevelt's address at Milwaukee, Wisconsin, given a few minutes after getting shot by some anarchist, www.businessinsider.com. October 14, 1912.
Theodore Roosevelt (2015). “Theodore Roosevelt on Bravery: Lessons from the Most Courageous Leader of the Twentieth Century”, p.44, Skyhorse Publishing, Inc.
Theodore Roosevelt (2015). “Theodore Roosevelt on Bravery: Lessons from the Most Courageous Leader of the Twentieth Century”, p.39, Skyhorse Publishing, Inc.