The NFL's best defense that went on to win a Super Bowl: 1969 Chiefs, 1973 Dolphins, 1974 Steelers, 1985 Bears, 1990 Giants, 2000 Ravens, 2002 Buccaneers, 2008 Steelers or 2013 Seahawks? - Baltimore Beatdown
Patriots' defense is historically great, no matter who they've played
Ten greatest defenses to reach a Super Bowl
Statistical analysis of the greatest defenses in NFL history - Behind the Steel Curtain
Was Seattle's defensive performance the best in NFL history? It's in the conversation
Remembering the 1985 Chicago Bears - ESPN Chicago
NFL Nostalgia: Ranking the Best Defenses in NFL History, News, Scores, Highlights, Stats, and Rumors
Was any NFL defense able to carry the team like the Ravens 2000 defense? - Quora
How do the 2019 Patriots stack up against the best defenses in recent NFL history?
Remembering NFL Best: Ranking The Top 10 NFL Defenses Since 1985, News, Scores, Highlights, Stats, and Rumors
2: The '85 Chicago Bears, Top Ten Defenses of All Time
Which NFL teams have allowed the fewest points in the 16-game era?
What is a great defense in today's NFL? - Big Blue View