Cuban American ump Laz Diaz promoted, Boricua Roberto Ortiz makes history - Our Esquina
Umpire Who Clashed With Joe Torre Loses Baseball Bias Case - Bloomberg
History of Umpiring 8
The ESPN Daily podcast -- How to listen, episode guide and more - ESPN
MLB appoints 1st black umpire crew chief
Chasing the Red Eagle – Texas Monthly
The History of Umpiring
MLB appoints its first African American and Mexican American umpire crew chiefs
Out umpire nearing 4,000th game
Alfonso Márquez - Wikipedia
6 Decades Before Jackie Robinson, This Man Broke Baseball's Color Barrier