The only day MLB players can wear No. 42? Jackie Robinson Day
The Cubs should retire several more jersey numbers - Bleed Cubbie Blue
Dave Stewart wore A's No. 34 with Rollie Fingers' blessing. Now both will have it retired
Appreciating the retired single-digit numbers of the New York Yankees
The unique Twins uniform numbers and the players who have worn them - Twinkie Town
Yankee Stadium: Monument Park - Retired Numbers - Mickey M…
Yankees Retired Numbers: 5 Fast Facts You Need to Know
List of Major League Baseball retired numbers - Wikipedia
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
History of retired numbers dates back to Lou Gehrig Day
New York Yankees retired Paul O'Neill's No. 21 jersey
The Yankees Just Tarnished Their Legacy by Retiring Paul O'Neill's Jersey
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
New York Yankees Retired Numbers - Sports Illustrated
Paul O'Neill Number Retirement Raises Debate - Last Word On Baseball