By the Numbers: Top C's of All Time - 44-66
Bill Russell's No. 6 jersey to be retired throughout NBA - NBA.com : r/nba
Kristaps Porzingis to wear Celtics jersey number with plenty of history – NBC Sports Boston
Every player in Boston Celtics history who wore No. 9
Every retired number for the Celtics and who wore it
List of National Basketball Association retired numbers - Wikipedia
Why do the Boston Celtics wear the number 24?
Iconic NBA numbers: #32 – Magic Johnson, Karl Malone, Kevin McHale, NBA News
Would Celtics re-issue retired numbers? Don't count on it – Boston Herald
Why was Boston Garden nearly empty when Bill Russell's number was retired in 1972? - The Boston Globe
History of Celtics retired numbers - CelticsBlog
NBA: Raised and Retired Numbers by Team
Every Boston Celtics jersey in team history worn by ONLY one player