Chicago Cubs: HOF closer Lee Smith to have uniform number retired
Retired Uniforms by Division: National League Central - Beyond the Box Score
History of retired numbers dates back to Lou Gehrig Day
NHL Numbers That Never Should Have Been Retired, News, Scores, Highlights, Stats, and Rumors
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
The next likely jersey retirement for every NFL team
Retired Uniform Numbers in the National League
Retired Uniforms by Division: National League West - Beyond the Box Score
A little group of collages I made featuring the most retired numbers in baseball : r/baseball
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
Retired Uniform Numbers in the American League
Bill Russell gets Miami Heat No. 6 honor before LeBron James
Giants to retire No. 25 jersey of Barry Bonds in August