List of Last Undefeated NFL Teams by Year
List of last undefeated NFL teams by season - Wikipedia
Eagles are the only remaining undefeated team in the NFL - Bleeding Green Nation
The Perfect Season': 1972 Miami Dolphins
History of the NFL's last undefeated teams: Eagles look to buck recent trend of Super Bowl shortcomings
Steelers undefeated: Here's a look at the other 12 teams that started 11-0 in Super Bowl era
10 Absolute Worst NFL Teams Since Expansion
Ranking NFL's five undefeated teams after Week 3 of 2021 NFL season
Eagles are 8-0, how other undefeated NFL teams fared in history – NBC Sports Philadelphia