By the book: NFL's stiff-arm rule
NFL says customized face masks are not allowed
J.K. Dobbins Enters His First Playoffs As a Star
Carry-on, Jerrion - The Daily Mississippian
Straight/stiff arm vs Face Masking - RiderFan Forums
Derrick Henry and the art of the stiff arm – Daily Press
NFL Penalties Need Fixing
Arizona Cardinals' David Johnson leads re-emergence of stiff-arm
NFL is testing face masks that contain surgical or N95 material - The Washington Post
The Art of the Stiff Arm NFL Films Presents
rules - In American football can it not be Illegal use of hands on the ball carrier? - Sports Stack Exchange
The stiff arm is the most underrated move in football. #nfl #nflrankin, vance mcdonald stiffarm
The Meaning of Derrick Henry's Stiff-Arms - Sports Illustrated
Sunday Night Football on NBC - Don't mess with Derrick Henry. 😳
The 11 NFL rule changes inspired by Cowboys players