People are only just realizing Miami Dolphins weren't the first NFL team to go through season undefeated
The Invincible '72 Miami Dolphins.
1972 Dolphins and others react to Eagles suffering first loss of season
The 1972 Miami Dolphins are STILL the only undefeated NFL team in the history of the world - The Phinsider
Perfect '72 Dolphins, still 'competing,' hope 'scary' Eagles lose a game
Dolphins To Honor 1972 Team As Greatest Team In NFL History Against Bengals
72 Dolphins' status as only perfect team may end in Valley, Sports
Social media celebrates '72 Dolphins remaining NFL's only undefeated team
Seventeen and Oh (Hardcover)
A Football Life': Unbeaten 1972 Miami Dolphins wore 'No Name Defense' nickname with badge of honor