The Patriots think they have a good grasp on NFL's new helmet rule - The Boston Globe
Lowering Your Head Now a Penalty in NFL - Sports Illustrated
Report: NFL's competition committee likely to pass automatic ejection rule
Suspensions for dangerous head-to-head hits begin now
NFL targeting rule: Owners say some hits to head to be penalty - Sports Illustrated
Shamarko Thomas' hit on Seahawks WR David Moore is NFL's first ejection under new helmet rules - Field Gulls
Ejections are now possible for helmet-to-helmet hits in the NFL
Responding to Criticism, N.F.L. Says Helmet Rule Will Not Change - The New York Times
NFL officiating video stresses new crown of the helmet rule - NBC Sports