1907 GAA, Official Guide "Football Rules"; quoted in Joseph Lennon, The playing rules of football and hurling, 1884-1995 (Northern Recreation Consultants 1997) p.66
1981 GAA, The Playing Rules of Football and Hurling; quoted in Joseph Lennon, The playing rules of football and hurling, 1884-1995 (Northern Recreation Consultants 1997) p.358