John Libka - Wikipedia
Mark Carlson (umpire) - Wikipedia
John Tumpane - Wikipedia
Umpire (baseball) - Wikipedia
Jerry Layne - Wikipedia
Angel Campos - Wikipedia
Tom Hallion - Wikipedia
Bill Welke - Wikipedia
Close Call Sports & Umpire Ejection Fantasy League: MLB Debut of Umpire Edwin Moscoso
Wally Bell - Wikipedia
Wikipedia:WikiProject Baseball/Umpires task force - Wikipedia
Todd Tichenor - Wikipedia