Why every MLB player is wearing No. 42 today
Majors celebrate 75th anniversary of Jackie Robinson's debut
Fans gather at Sullivan Field to honor Jackie Robinson Day
April 15, 1997: Ken Griffey Jr. wears number 42 to honor Jackie Robinson on 50th anniversary – Society for American Baseball Research
In honor of Jackie Robinson Day, the social significance of jersey numbers in sports – New York Daily News
Jackie Robinson: A Legacy of Activism - The American Prospect
Column: Remembering Jackie Robinson in town where it started
In honor of Jackie Robinson Day, the social significance of jersey numbers in sports – New York Daily News
No. 42 jersey tribute began in 2007 with Griffey
In honor of Jackie Robinson Day, the social significance of jersey numbers in sports – New York Daily News