NFL history: 100 people who shaped the league, pro football
Halas, the Father of the NFL - Dawgs By Nature
George Halas came 50 minutes from losing the Bears in 1933 — until
Throwback: The truth about George Halas and the NFL's ban on black
On this date: George Halas retires an an NFL head coach. - ESPN
The Life And Career Of NFL Pioneer Fritz Pollard (Complete Story)