File:49ers retired numbers at Candlestick Park group 2.JPG - Wikimedia Commons
Orlando Magic need to honor history and retire jerseys
Have the Yankees taken retired numbers too far?, Bronx Pinstripes
File:Skydome retired numbers.jpg - Wikimedia Commons
File:49ers retired numbers at Candlestick Park 2010-08.JPG - Wikimedia Commons
List of National Basketball Association retired numbers - Wikipedia
Every MLB team's retired numbers
Out of the Park Developments Online Manuals
File:Banks-Santo retired numbers.jpg - Wikipedia
Retired Uniform Numbers in the American League
History of retired numbers dates back to Lou Gehrig Day
LOOK: Retired jersey numbers in Lakers history
Houston Astros: Top 30 players in franchise history - Page 28