1972 Dolphins remain only perfect team in NFL's 100 years: Here's every team's best unbeaten start
National Football League - 1972 NFL Season Overview
The 1972 Miami Dolphins still have the NFL's only perfect season - The Washington Post
NFL teams that came closest to going undefeated, joining the 1972 Dolphins as members of the perfect club
1972 Miami Dolphins: The inside story of the only perfect season in NFL history
Miami Dolphins celebrates 50 years of the only perfect team in NFL history with several of its legends
Miami Dolphins' Larry Csonka recalls NFL's longest game, on Christmas
1972 Miami Dolphins: The inside story of the only perfect season in NFL history
Undefeated: Inside the 1972 Miami Dolphins' Perfect Season by Freeman, Mike: New (2012)
1972 Miami Dolphins: The inside story of the only perfect season in NFL history
NFL teams that came closest to going undefeated, joining the 1972 Dolphins as members of the perfect club
1972 Miami Dolphins: The inside story of the only perfect season in NFL history