Bill Russell's No. 6 jersey first ever to be retired across entire NBA - CBS News
75 greatest NBA players ever: The HoopsHype list
The NBA Is Retiring The No. 6 League-Wide To Honor Bill Russell - Fadeaway World
Bill Russell's No 6 jersey retired across NBA, in 1st for league, Basketball News
Bill Russell's No. 6 jersey to be retired throughout NBA - NBA.com : r/nba
NBA permanently retires Bill Russell's No. 6 - The Washington Post
NBA retires legend's jersey number in league-first