How George Halas' columns for the Chicago Tribune, a field goal and a charity game helped the Chicago Bears prove their legitimacy in 1935
Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times
Grave Story: George Halas (1895-1983) – RIP Baseball
List of best NFL players from Chicago area evokes epic all-era roster
GEORGE HALAS '20 NEW YORK YANKEES, LATER FOUNDER OF CHICAGO BEARS & NFL
Bears-Packers Is One of Sports' Oldest Rivalries
Grave Story: George Halas (1895-1983) – RIP Baseball
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron