College football rule changes: Fixing OT, targeting and more - Sports Illustrated
We need to make football safer: Column
NFL expects fewer kickoff returns with new fair catch rule inside 25
Study: Kickoff rule tied to fewer concussions
Why Are We Still Returning Kicks In College Football?
NFL preseason could be a good test of how teams approach the league's new kickoff rule
Ivy League Admits Officiating Error, But Princeton Football Remains Victorious over Harvard, Sports
Study: Kickoff rule tied to fewer concussions
Kickoff (gridiron football) - Wikipedia
After a small change in kickoff rules, Ivy League football players saw a big drop in concussions - Los Angeles Times
Evolution of the NFL Rules
Football Opens Ivy League Play Saturday Against Princeton - Columbia University Athletics