Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times
Chicago Bears - Wikipedia
How George Halas' columns for the Chicago Tribune, a field goal and a charity game helped the Chicago Bears prove their legitimacy in 1935
George Halas a real pro in fostering NFL-media relationship
George Halas: Bears architect still going strong at 82 - Sports Illustrated Vault
Report: $100,000 worth of equipment stolen from Chicago Bears at Soldier Field
News Chicago Bears Official Website
How George Halas' columns for the Chicago Tribune, a field goal and a charity game helped the Chicago Bears prove their legitimacy in 1935
The NFL's original Spy vs. Spy: Packers-Bears