Yankee Legends number 4 Greeting Card by David Lee Thompson
History of retired numbers dates back to Lou Gehrig Day
Yankees retired numbers - Newsday
Lou Gehrig New York Yankees Career Commemorative Premium Poster Print – Sports Poster Warehouse
Every MLB team's retired numbers – NBC Sports Chicago
Today in history - June 2 - Baseball legends Lou Gehrig died and Babe Ruth retired
Who were the first and last Yankees players to wear the retired numbers? - Pinstripe Alley
History of retired numbers dates back to Lou Gehrig Day
Every MLB team's retired numbers
Pack has retired just six uniform numbers - Hub City Times
Yankees retired numbers
70 years after his death, baseball observes inaugural Lou Gehrig Day
Mariners putting on ALS Awareness Night before MLB's Lou Gehrig's Day