A Close Look at a 1965 NFL Uniform Article
Matt Nagy proud that Bears players addressed uniform controversy in video - Chicago Sun-Times
Duke Slater, NFL's 1st Black lineman, is now Hall of Famer
To beat the Bears, Broncos' offensive line must be a brick wall - Mile High Report
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
The NFL's Humble Beginnings
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
George Halas – Society for American Baseball Research
Chicago Sports – ReadJack.com
George Halas was a pro basketball pioneer as well
George Halas Through the Years
George Halas: Bears architect still going strong at 82 - Sports Illustrated Vault