History.com Staff. "Calvin Coolidge." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "Woodrow Wilson." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "William Howard Taft." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "Theodore Roosevelt." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "William McKinley." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "Woodrow Wilson." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "William Howard Taft." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "Theodore Roosevelt." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.
History.com Staff. "William McKinley." History.com. A&E Television Networks, 2009. Web. 30 Mar. 2017.