Williams collared for tackle, NFL News
Terrell Owens: Career retrospective
SB loss to Pats foiled Faulk – Boston Herald
Williams suspended one game for tackle on McNabb - ESPN
Study finds career-threatening blows to head or neck common in NFL - Los Angeles Times
Wagoner football player invents X Collar to prevent horse collar tackles
NFL Players That Changed the Rules of the Game, News, Scores, Highlights, Stats, and Rumors
Odell Beckham Jr. suspension: A look at recent NFL bans for on-field actions
NFL Players With Long Hair Could Be in for a World of Pain - Racked
Patrick Mahomes, Tony Pollard ankle injuries caught the NFL's attention - The Washington Post
Roy Williams: Player News - NBC Sports - NBC Sports
Cowboys' Williams injured four with tackle in 2004 - ESPN
NFL approves expansion of horse-collar rule - NBC Sports
Super Bowl 2018: Revisiting the Patriots vs. Eagles, 13 years later
Roy Williams Joins Wagoner Family To Prevent 'Horse Collar' Injuries