Bill Russell's No. 6 is being retired across the NBA : NPR
Barry Bonds to have No. 25 retired by the Giants
LeBron on course to join legends with jerseys retired by multiple teams
Retired Uniform Numbers in the National League
How players are using uniform numbers to break MLB's unwritten rules - ESPN
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
All-Time Brooklyn & Los Angeles Dodgers Retired Numbers
When every baseball team will run out of uniform numbers - All My Sports Teams Suck
Los Angeles Dodgers to retire Fernando Valenzuela's No. 34 jersey
Banks, Ernie #14 - Game Played Relic – Stadium Pen Blanks
Hank Aaron, Biography, Baseball, & Facts
Giants to retire No. 25 jersey of Barry Bonds in August
Rich tradition of retired numbers part of game's legacy
Full list of Atlanta Braves retired numbers -- and when they were retired
Retired Uniform Numbers in the American League