NFL's Depression-era ban on Black players lingers on in the owner's box - The Philadelphia Sunday Sun
George Halas Through the Years
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
NFL's Depression-Era Ban on Black Players Lingers On in the Owners Box
NFL History: 100 objects that tell the story of football - Sports Illustrated
Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
WCG's Jack Silverstein Brings History Into Focus - Windy City Gridiron
NFL All-Time Team: George Halas