The NFL's best defense that went on to win a Super Bowl: 1969
Wilber Marshall, Mike Singletary and Otis Wilson
Dick Butkus, fearsome Hall of Fame Chicago Bears linebacker, dies
Here are the best NFL defenses in history – NBC Sports Chicago
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Super Bowl XX: 1985 Bears defense pounds Patriots - Sports
The 1985 Bears reign supreme as our greatest NFL team ever
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Buddy Ryan, mastermind behind 1985 Bears defense, dies at 82
Arthur Brown Packs on Pounds
Top Ten Single Season Defenses in NFL History : #1 1985 Chicago
Schmuck: Broncos defense doesn't measure up to '85 Bears or 2000