Gehrig bids farewell in Yankee Stadium - Post Bulletin
Retired number - Wikipedia
National Pastime Museum: LOU GEHRIG APPRECIATION DAY AT 75 – Marty Appel
Derek Jeter will be final single-digit number retired by Yankees - Newsday
Lou Gehrig's disease: Why ALS is forever associated with one of America's baseball greats
On This Day, July 4: Lou Gehrig announces retirement
Lou Gehrig Day: MLB to honor Yankees legend annually - Sports Illustrated
New York Yankees Retired Numbers - Sports Illustrated
High and Tight: Our Rock & Roll Baseball Experts Talk Retired Numbers