How Umpires Work
As They See 'Em: A Fan's Travels in the Land of Umpires: Weber, Bruce: 9780743294133: : Books
MLB umpire shares his opinion of new rules: Ken Rosenthal's conversation with Dan Bellino - The Athletic
Pirates staff takes a tour of MLB's replay center
AP sources: MLB umpire tests positive for virus, crews shift
MLB umpires get support from players in 'perfectly imperfect' game
It's a Really Weird Time to Be an Umpire - The New York Times
MLB to expand instant replay in 2014
Replay review and ejections - Beyond the Box Score
Umpire calls timeout then acts like he didn't call timeout, a breakdown
Baseball's replay system is breaking. How can it be fixed?
Dodgers news: MLB's first umpire announcement for replay reviews - True Blue LA
How MLB Umpires Learned to Explain Replays to Crowds - The New York Times