The History of Natural Diamond Super Bowl Rings
Bears won Super Bowl 32 years ago Friday
How are Super Bowl rings made? - WTMJ
Fridge' For Sale: William Perry's Super Bowl XX Jersey Hits Auction Block
William 'The Refrigerator' Perry's Super Bowl touchdown remembered, NFL News
2002 Spotlight - Wk 10 boxscore - SB XX
NFL legend The Fridge gets his Super Bowl ring back from 10-year-old fan who bought it for $8,500
Super Bowl XX - Wikipedia
Former Chicago Bears great William Perry gets Super Bowl ring back - ESPN