Will LeBron James change his number on Lakers? NBA retires Bill
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers
Every MLB team's retired numbers
A number of nuggets about retired numbers around the Major League
Which NBA team has the most jersey numbers retired? - AS USA
Rick Nash's No. 61 deserves spot in rafters of Nationwide Arena
The most random number retirements across all sports
List of National Football League retired numbers - Wikipedia
Retired Jerseys - Army West Point
History of retired numbers dates back to Lou Gehrig Day
Every MLB team's retired numbers
Infographic: Packers' retired numbers