Al Horford - Wikipedia
Iconic NBA numbers: #13 - Wilt Chamberlain, Steve Nash
Boston Celtics – NBC Sports Boston
NBA Countdown: Who wore No. 40 best?
Category:Players who wear/wore number 20, Basketball Wiki
Top 50 NBA players from last 50 years: Larry Bird ranks No. 7
NBA Countdown: Which player wore No. 33 best in league history?
Every player in Boston Celtics history who wore No. 20
Every player in Boston Celtics history who wore No. 9
Every player in Celtics history who wore No. 20