New York Yankees: The Numbers on the Wall
New York Yankees - Wikipedia
Yanks to retire numbers for Williams, Pettitte, Posada
Every MLB team's retired numbers – NBC Sports Chicago
History of retired numbers dates back to Lou Gehrig Day
Can we name every Yankees Retired Number in numerical order? : r/talkinyanks
Yankees Retired Numbers Quiz
Names and Numbers: NY Yankees
The Greedy Pinstripes: The Yankee Stadium Experience - Part One: Monument Park
Power of Derek Jeter's No. 2 - MLB's most productive jersey numbers
Yankees retired numbers and the baseball legends who wore them
New York Yankees: 5 numbers that need to be un-retired