History of retired numbers dates back to Lou Gehrig Day
HALLOWED GROUND: Monument Park, New York Yankees Museum honor greatest players from most legendary team in sports - Sports Collectors Digest
Revisiting death of Yankees legend Lou Gehrig 80 years later
Jeter's retirement marks end of Yanks' single-digit numbers
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MLB celebrates second annual Lou Gehrig Day
An Awful Lot to Live For”: Lou Gehrig's Final Season in the News – The Unwritten Record
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Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times
Lou Gehrig New York Yankees Career Commemorative Premium Poster Print – Sports Poster Warehouse
Derek Jeter will be final single-digit number retired by Yankees - Newsday
