NFL doesn't allow players to switch numbers during season - NBC Sports
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
The Era of NFL Wide Receivers Wearing Jersey Numbers in the 80s Is Officially Dead - The Ringer
New Cowboys QB Dak Prescott changed his jersey number to honor his mom
Logos and uniforms of the Chicago Bears - Wikipedia
Chicago Bears - Wikipedia
NFL Rookie Numbers: Tracking Every Jersey Number for the 2023 Class
NFL jersey number updates: Tracking which NFL players wear No. 0 - ESPN
Top 10: Bears who switched jersey numbers
The Best Chicago Bears Of All Time By Jersey Number: #00-9
Chicago Bears Assigned and Changed Jersey Numbers - The Chicago Audible
Vikings Justin Jefferson breaks record, embarrasses Bears – NBC Sports Chicago
Dick Butkus, famous Chicago Bears linebacker, has died at 80 : NPR
The best NFL jerseys, ranked - The Post
Why NFL players were drawn to jersey No. 0 after its return - ESPN