Paralyzed former Patriot Stingley dies at age 55
Hardest Hitting NFL Players of All Time - Philadelphia Sports Nation
The Stingley family carries a legacy of football's beauty and brutality
Jack Tatum, N.F.L.'s 'Assassin,' Dies at 61 - The New York Times
Obituary: Jack Tatum dies at 61; Oakland Raider safety whose hit left Darryl Stingley paralyzed - Los Angeles Times
The Brains In Football: Meet the doctors trying to solve NFL's CTE issue – New York Daily News
A nickname or reputation, no matter how fierce, did not reflect all of Ohio State star Jack Tatum: Bill Livingston
NFL Nicknames - Sports Illustrated
Stingley left lasting image
3 Forgotten Raiders Who Should Be in the Hall of Fame
NFL's worst preseason injuries
Was Jack Tatum the hardest hitting safety ever? - Quora
Ex-QB Steve Grogan Slams Deceased Jack Tatum
Opinion “The Last headbangers NFL Football in the Rowdy, Reckless '70s — the Era that Created Modern Sports” by Kevin Cook - The Washington Post