1968: George Halas retires as coach of Chicago Bears
Boise State football: 100 days, with an asterisk
George Halas (American Football Coach and Team Owner) - On This Day
GEORGE HALAS, FOOTBALL PIONEER, DIES - The New York Times
Grave Story: George Halas (1895-1983) – RIP Baseball
Bears's great Dick Butkus passes away at 80
100 Things Bears Fans Should Know & Do Before They Die (100 ThingsFans Should Know): McDill, Kent, Joniak, Jeff: 9781600784125: : Books
This week in history: George Halas, 'Papa Bear,' steps down - Chicago Sun-Times
Grave Story: George Halas (1895-1983) – RIP Baseball