Paul O'Neill Yankees No. 21 retired
Opposing fans need to shut up about Yankees retiring Paul O'Neill's number
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankees to retire Joe Torre's number, honor Tino Martinez and Paul O'Neill - Sports Illustrated
Paul O'Neill's No. 21 to be retired by Yankees
Paul O'Neill's No. 21 journey started at his first MLB game
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Derek Jeter's No 2 retired by Yankees; Monument Park plaque unveiled
Yankees Retired Numbers
Number 21 Continues to Remain Sacred to the New York Yankees, News, Scores, Highlights, Stats, and Rumors
A-Rod: 'It bothers me' Yankees haven't retired my number : r/NYYankees
Former teammates, coaches weigh in on Paul O'Neill ahead of Yankees' number retirement