NFL passes minor expansion of replay rules - NBC Sports
Ravens' Replay Rule Proposal Tabled, Two More Rules Passed
NFL Instant Replay: Reviewing the rule is harder than reviewing the play - Behind the Steel Curtain
Rosenthal: 5 possible ways to improve MLB's instant replay system - The Athletic
History of Instant Replay
A brief look at the NFL's 16 rule change proposals - Dawgs By Nature
NFL adopts rule changes for 2019 season
Replay in sports: Ranking the systems from best to worst
History of Instant Replay
Illegal batting: NFL should make all plays reviewable - Sports Illustrated
NFL announces 2019 playing rules proposals
NFL will consider making pass interference calls reviewable after Rams-Saints playoff gaffe
NFL expands replay system to include more reviewable plays
From the NFL Owners Meetings: Approved 2023 Playing Rules, Bylaws and Resolutions
Pass interference now reviewable by NFL officials - ESPN