NCAA horse-collar tackle rule changes for 2017. Here's how.

Everything you need to know about the new point-after-touchdown conversion rules – Football Zebras

There's More Than Rules in Regulating Concussions - Bill of Health

Penalty (gridiron football) - Wikipedia

UCLA football mailbag: Can UCLA's young talent grow up in time? – Daily News

NFL competition committee proposes a ban on hip-drop tackles and a radical change to kickoffs – KGET 17

Did officials miss a horse-collar tackle of Bills QB Josh Allen by Haason Reddick? - Yahoo Sports

History of The Tackle - Atavus

NFL Video Rulebook - Horse Collar, National Football League, video recording

2017's 4 new college football rules, briefly explained by the head of refs

NFL history: 100 people who shaped the league, pro football - Sports Illustrated

2017's 4 new college football rules, briefly explained by the head of refs

Fewer clock stoppages on first downs and more 2023 college football rule changes

NFL considers banning hip-drop tackles - NBC Sports