Bogage, Jacob. “Baseball's Robot Umpires Are Here. And You Might Not Even Notice the Difference.” The Washington Post, WP Company, 11 July 2019, www.washingtonpost.com/sports/2019/07/10/baseballs-robot-umpires-are-here-you-might-not-even-notice-difference/.

Lacques, Gabe. “MLB to Test Automated Strike Zone – a Step toward 'Robot Umpires' – during Spring Training.” USA Today, Gannett Satellite Information Network, 21 Feb. 2020, www.usatoday.com/story/sports/mlb/2020/02/21/mlb-to-test-robot-umpires-in-spring-training/4830417002/.