NFL rule changes to be discussed at league owners meetings - Sports Illustrated
Game Previews and Reviews - Page 44 of 112 - Big Blue Interactive
Official Super Bowl 51 Game Program
Evolution of the game: The past decades have seen multiple changes to make NFL action more compelling
Targeting needs to be addressed in the offseason : r/CFB
Momentum builds for replay review of hits on defenseless players - NBC Sports
Review for Two – Cardboard Clash
NFL will not renew replay review for pass interference
A targeting call gets overturned, and that's just the start of Syracuse's misery: 'I saw a clean hit'
There's more to this than a win over the Giants. Shanahan makes a statement
Cardboard Clash – Page 3 – Taking a look at board games playable with either one or two players.
The defenseless receiver rule : r/nfl
NFL Rulebook NFL Football Operations