George Halas: Father of the NFL Who Also Served in Both World Wars
George Halas – Society for American Baseball Research
NFL members in the military
Chicago Bears celebrating their rich military history
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
World War II hero led a memorable pro football life - VA News
George Halas: Bears architect still going strong at 82 - Sports Illustrated Vault
Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times