A look at which NFL teams have the most officially retired numbers

Should the Jets retire Darrelle Revis' number 24?

How Many Jersey Numbers have been Retired in the NFL?

Retired Numbers and Honored Jerseys - University of Michigan Athletics

Rank'Em: Cowboys' Most Sacred Jersey Numbers

What are some “unofficially” retired numbers that are not reissued? : r/nfl

List of National Football League retired numbers - Wikipedia

What are some “unofficially” retired numbers that are not reissued? : r/nfl

Kent Somers: Digging Out Of The 0-2 Hole In The NFL

The Pittsburgh Steelers list of unofficially retired numbers

History of retired numbers dates back to Lou Gehrig Day

Football: Cony High retires No. 13 to honor former standout quarterback Ben Lucas

Chargers to Retire Numbers of Pro Football Hall of Fame Receiver Charlie Joiner and Pro Football Hall of Fame Tight End Kellen Winslow