NFL moves to 17-game regular season in 2021: What it means for teams, players, revenue and fans - ESPN
Canadian football, History, Teams, Field, Rules, History, & Facts
NFL Color Rush - Wikipedia
New Jersey Number Rule Expected from NFL - Sports Illustrated New Orleans Saints News, Analysis and More
NFL owners pass rule expanding eligible jersey numbers for certain positions
Football Jersey Numbers List
NFL rule changes for 2021; jersey number expansion
2021 N.F.L. Rule Changes: A Viewer's Guide - The New York Times
NFL likely to pass rule allowing more single-digit jersey numbers
Tracking all the new NFL uniforms and helmets for the 2022 season - ESPN
NFL Key Numbers for Point Spreads and Over/Unders for 2023