History of retired numbers dates back to Lou Gehrig Day

Lou Gehrig Is The New York Yankees' First Honored Legend

10 Things You May Not Have Known About Lou Gehrig - Phi Delta Theta Fraternity

New York Yankees - Wikipedia

MLB Celebrates Inaugural Lou Gehrig Day

Gehrig, Lou Baseball Hall of Fame

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

Yankees retired numbers and the baseball legends who wore them

Pack has retired just six uniform numbers - Hub City Times

Derek Jeter will be final single-digit number retired by Yankees - Newsday

Rangers set to make Pudge's No. 7 their third retired number; who should be next, plus a historical look

Baseball In Pics on Instagram: “Lou Gehrig had his number 4 retired, and gave one of the great speeches in history on “Lou Gehrig Day”, July 4, 1939.”

Gehrig bids farewell in Yankee Stadium - Post Bulletin

HALLOWED GROUND: Monument Park, New York Yankees Museum honor greatest players from most legendary team in sports - Sports Collectors Digest