April 15, 1997: Ken Griffey Jr. wears number 42 to honor Jackie Robinson on 50th anniversary – Society for American Baseball Research
Why are Boston Red Sox players all wearing No. 42 jerseys? Jackie Robinson day across the MLB
Last player to wear No. 42 for each MLB team
TIME for Kids
Jackie Robinson's Long Fight Against Discrimination, by Seth S. Tannenbaum, Weekend Caucus
MLB players to wear No. 42 — in Dodger blue — for 75th anniversary of Jackie Robinson's big league debut
Why every MLB player is wearing No. 42 today
Mariners at forefront of establishing Jackie Robinson Day
Jackie's rights
Baseball's Jackie Robinson Day Needs to Be More Than Just a Gesture
Jackie Robinson Day Celebrations for 75th Anniversary of MLB Debut
The only day MLB players can wear No. 42? Jackie Robinson Day