NFL rule changes: Proposals for 2019 heavy on replay, new overtime format
NFL considers alternatives to the kickoff, including the XFL model : r/nfl
USFL Preview: How to Attack Roster Requirement Changes on DraftKings
NFL owners to vote on rule changes proposed by the Chiefs and others - Arrowhead Pride
League rules are changing at the NFL meetings in Phoenix - Arrowhead Pride
NFL Rule Changes 2019: “4th and 15” onside kick alternative rejected by team owners - Field Gulls
NFL overtime rule change: Three teams vote no on league's latest proposal - Sports Illustrated
NFL teams submit 7 rule change proposals aimed at adding booth official, restoring OT format
NFL rule changes 2021: Eagles propose onside kick alternative, new OT rule – NBC Sports Philadelphia
XFL rules, explained: The biggest differences vs. NFL, including overtime, 3-point PAT tries & double forward pass
Fun alternative to the onside kick among NFL rule change proposals - Footballscoop
NFL owners to talk replay expansion at Annual League Meeting
New USFL rules include three-point tries, best-of-three overtime shootout, onside kick alternative