File:New Jersey Devils retired numbers 27 3 4 in Feb 2013.jpg - Wikipedia
Red Sox: Ranking players who have had numbers retired at Fenway Park
File:Mets retired numbers.png - Wikipedia
Retired Jerseys, Los Angeles Lakers Lakers
File:Miller Park Retired Numbers (4952579861).jpg - Wikimedia Commons
Retired number - Wikipedia
Kobe Bryant and 8/24: One player, two numbers and two Hall of Fame careers with Lakers
File:Padres retired numbers.JPG - Wikipedia
History of retired numbers dates back to Lou Gehrig Day
Lakers News: First Great Lakers Center Will Have Jersey Posthumously Retired - All Lakers
The history - and expedience - of the Twins retiring jersey numbers - Twinkie Town
All-time list of retired numbers in the NBA