NFL players won't stop using helmets as weapons until the league imposes stiff penalties and suspensions - ESPN
Don't Know Tough': Book unmasks violent hypocrisy of football culture
Chronology of kickoff rules changes – Football Zebras
Off the Grid: The NFL's credibility gap, Andre Smith Q&A - Sports Illustrated
What's a Catch? In the N.F.L., the Rule Seems Impossible to Grasp - The New York Times
Los Angeles Times - Vol. 140 No. 303 (02 Oct 2021), PDF, Influenza
Top 5 Penn State offensive players that need to play well against Utah - On3
Don't Know Tough': Book unmasks violent hypocrisy of football culture