Ten MLB umpires are 'set to retire at the end of the month' - the LARGEST turnover since 1999
Angel Hernandez had a horrific night before Kyle Schwarber's outburst
The Fates of the 22: MLB Umpire Resignations in 1999 – Society for American Baseball Research
Gibson makes final call: MLB umpire retires after 24-year career, Sports
The Baseball Analysts: Change-Up Archives
Dazed and confused: Yankees, Rays stood around for 16 minutes while MLB umps figured out rule
For aspiring major league umpires, the road is long and hard - ESPN
MLB Fans Rightfully Ripped Ump After Bad Call Led to Multiple Ejections - Sports Illustrated
2015 LSU Baseball Official Yearbook by LSU Athletics - Issuu
The Latest 2020 Weirdness: A Triple-Digit MLB Ump!
How MLB Umpires Learned to Explain Replays to Crowds - The New York Times