Dick Butkus, fearsome Hall of Fame Chicago Bears linebacker, dies at 80 - ABC News
Bears vs. Packers still brings the 'heat'
Pigskin: The Early Years of Pro Football: Peterson, Robert W.: 9780195119138: : Books
Recalling Pre-Season Football, The Old School Days
Once a fierce Chicago Bears rival, what ever happened to the NFL's Rock Island Independents? - The Athletic
THE KING Hugh McElhenny-A San Francisco 49ers Legend: The Greatest Open-Field Runner of His Era- George Halas, Chicago Bears: Jacobs, Martin S.: 9798724328227: : Books
Gale Sayers, Bears Hall of Fame running back, dies at 77
Ranking the 100 best Bears players ever: No. 11, Mike Ditka
Bears known for superstar middle linebackers
Dick Butkus, Chicago Bears legend and Hall of Famer, dies at 80 - Los Angeles Times
Gale Sayers Dies; Elusive Hall of Fame Running Back Was 77 - The New York Times