Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
All-time list of retired numbers in the NBA
Lakers News: First Great Lakers Center Will Have Jersey Posthumously Retired - All Lakers
Dolphins retired jersey numbers: Time to formalize Jason Taylor and Zach Thomas - The Phinsider
Yankees Retired Numbers
Eagles Question of the Day: How do you feel about the team's unofficial retired jersey numbers? - Bleeding Green Nation
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Los Angeles Dodgers to retire Fernando Valenzuela's No. 34 jersey
Retired number - Wikipedia
Will Lakers retire both of LeBron James' jersey numbers when he hangs it up? - Los Angeles Times
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
Bill Russell's No. 6 jersey to be retired throughout NBA
History of retired numbers dates back to Lou Gehrig Day