Bibiliography

"HISTORY OF FOOTBALL – Page 3 of 4" HISTORY OF FOOTBALL – Page 3 of 4 | Court & Field Dimension Diagrams in 3D, History, Rules – SportsKnowHow.com. Internet Marketing Unlimited, Corp, n.d.24 Apr, 2019
https://sportsknowhow.com/football/history/football-history-3.shtml