↑Reilly, Thomas; Gilbourne, D. Science and football: a review of applied research in the football code. Journal of Sports Science. 2003, 21: 693–705. doi:10.1080/0264041031000102105.
↑Bailey, Steven. Living Sports History: Football at Winchester, Eton and Harrow. The Sports Historian. 1995, 15 (1): 34–53. doi:10.1080/17460269508551675.
↑The first game of American football is widely cited as a game played on November 6, 1869, between two college teams, Rutgers and Princeton. But the game was played under rules based on the association football rules of the time. During the latter half of the 1870s, colleges playing association football switched to the Rugby code.
↑In 1845, the first rules of rugby were written by Rugby School pupils. But various rules of rugby had existed until the foundation of the 橄榄球联合会 in 1871.
↑There are Canadian rules [1] established by Football Canada. Apart from this, there are also rules [2] established by IFAF.
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