References
Home Page
Fuller, Steve. “Topic: National Football League (NFL).” Www.statista.com, www.statista.com/topics/963/national-football-league/.
History Page
Staff, History. “Who Invented Football?” History.com, A&E Television Networks, 25 Sept. 2013, www.history.com/news/who-invented-football.
“Pro Football Hall of Fame.” Pro Football Hall of Fame Official Site, www.profootballhof.com/football-history/birth-of-pro-football/.
“History of American Football.” Wikipedia, Wikimedia Foundation, 8 Apr. 2019, en.wikipedia.org/wiki/History_of_American_football.
Rules Page
“NFL Football.” The Washington Post, WP Company, 2019, stats.washingtonpost.com/fb/glossary.asp.
Wood, Robert. “Football Basics.” Topend Sports, Science, Training and Nutrition, Topend Sports Website, 2008, www.topendsports.com/sport/gridiron/basics.htm.