10 Major League Baseball umpires retire in historic exodus
Greg Gibson, The Home Plate Umpire, Retires After 25 Years of NL & MLB Baseball
MLB Call-Up Umpire Hiring Outlook - 2019 Break - Close Call Sports & Umpire Ejection Fantasy League
MLB umpire retirements, promotions
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Tony Corrente, the longest-tenured active NFL referee, is one of 8 retiring officials – Football Zebras
Sources - 10 MLB umps retiring, most since '99 - TSN.ca
Chicago Cubs team ownership history, 1876-1919 – Society for American Baseball Research
Baseball Toaster: Dodger Thoughts : Big Game Hunting
Lou Brock dies at 81
Big league pitcher swore he threw a perfect game, Sports
Sources - 10 MLB umps retiring, most since '99 - ESPN
MLB umpire retirements, promotions
