Super Bowl: History of back-to-back winners
Cincinnati Bengals, one of 12 teams that have never won the Super Bowl
Pittsburgh Steelers Super Bowl Championship Wins - Sports Illustrated
Minnesota Vikings - Wikipedia
9 Reasons The Vikings Haven't Won A Super Bowl - CBS Minnesota
Minnesota Vikings stats and facts, NFL News
Do the Bills or Vikings have the most crushing NFL playoff losses?
The Loop Special Report > Top Vikings-49ers games
The Kansas City Chiefs Waited 50 Years for This Super Bowl Date - The New York Times
How The Kansas City Chiefs Won The Super Bowl - The New York Times
Power Ranking the New York Giants Super Bowl Wins by Importance, News, Scores, Highlights, Stats, and Rumors