NFL rule change: Inside story of the SkyJudge proposal for 2020 - Sports Illustrated
NFL's new rule proposals could see onside kick replaced by all-or-nothing option – KNBR
Goodell sees more discussion coming on fourth-and-15 alternative to onside kick : r/nfl
Will NFL block extra-point kicks? – Football Zebras
What The Seahawks Said Following Their 27-11 Preseason Loss To The Bears
2021 NFL rule changes: Expanded jersey numbers among 6 new rules
NFL kickoff variations through the years and how it compares to other leagues - The Athletic
NFL rule proposal primer: Changes to overtime, onside kicks and more?
NFL Rule Updates: Preseason Overtime, Jersey Number Expansion, Two Forward Pass Penalty, Onside Kicks & More
NFL approves of expanded selection of jersey numbers for most players