Chicago Bears founder George Halas played a part in everything for NFL - Chicago Sun-Times
NFL History: 100 objects that tell the story of football - Sports Illustrated
George Halas came 50 minutes from losing the Bears in 1933 — until soon-to-be Cardinals owner Charles Bidwill bailed him out - Windy City Gridiron
NFL's Depression-era ban on Black players lingers on in the owner's box - The Philadelphia Sunday Sun
Jack Silverstein Profile and Activity - Page 4 - Windy City Gridiron
Jack M Silverstein - Director of Custom Content - Aging Media Network
1967-12-15 George Halas coaches 497th and last game, win 318 vs Falcons for Bears
Papa Bear George Halas HD
Jack M Silverstein - Director of Custom Content - Aging Media Network
NFL history: 100 people who shaped the league, pro football - Sports Illustrated