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

NFL approves expansion of horse-collar rule - NBC Sports

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

NCAA recommends three rules changes for 2017 - Footballscoop

College football rule changes 2017: Area for horse-collar tackle penalties expanded

NCAA: No hurdling to block kicks; status quo for targeting, National Sports

College football rule changes for 2023: Here's what you need to know - College Football HQ

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

Horse-collar tackle - Wikipedia

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

Roy Williams, Chris Simms dueling ages after Superman play in OU-Texas

Need-to-Know Rule Changes for 2017 College Football Season

How college football overtime works

NCAA Football Rules Committee recommends safety changes, but none for targeting