Pittsburgh Pirates/Steelers: Before Chuck Noll (1933-1968)
The complete history of the Bears-Packers rivalry - Windy City Gridiron
Column: Gale Sayers' Chicago Bears legacy is about more than just numbers and highlight reels. He taught us how to love one another. – Orlando Sentinel
Chicago Bears: 49ers series is an underrated rivalry – Twin Cities
1968 Week 12 - Bears vs Saints
NFL Week Two Stats: Josh Allen matches Jim Kelly mark as he tops 10,000 passing yards, NFL News
Pro Football Journal: DOUG BUFFONE: A Steadying Influence, Too Often Overlooked
Gale Sayers's Balletic Runs Obscure Football's Brutal Endings - The New York Times
Bulldog Turner - Wikipedia