Most iconic NBA numbers: #34 – Shaquille O'Neal, Charles Barkley, Hakeem Olajuwon, NBA News
Carmelo Anthony, NBA legend and one of the league's most prolific scorers, retires after 19 seasons
Dirk Nowitzki becomes first player to have number retired by German Basketball Federation - ESPN
LeBron James switching back from No. 6 to No. 23 'out of respect' for late Bill Russell
Will the Clippers Ever Retire Chris Paul's Number? - The Ringer
NBA players with two different numbers retired
Which NBA players have had their jersey retired by multiple franchises?
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
Erving doesn't think it makes sense for NBA to retire Kobe's numbers – NBC Sports Boston
Retired number - Wikipedia
Bill Russell's No. 6 is being retired across the NBA : NPR