NFL shuts down rulebook loophole Raiders had been exploiting for past two weeks, per report
2 XFL rules that could work in the NFL – and 2 the NFL should avoid – Football Zebras
Official (gridiron football) - Wikipedia
Rules review video: Targeting, replay tools, and an experiment with the kickoff line – Football Zebras
Which XFL rules should the NFL consider stealing? - ESPN
Rules review video: Illegal forward pass, illegal touching, and simulated kneeldowns – Football Zebras
3-tiered extra point, kickoff changes among new XFL rules
2 XFL rules that could work in the NFL – and 2 the NFL should avoid – Football Zebras
Which XFL rules should the NFL consider stealing? - ESPN