Sources - 10 MLB umps retiring, most since '99 - ESPN
The Umpire Is Out: Calling the Game and Living My True Self: Scott, Dale, Neyer, Rob, Bean, Billy: 9781496230447: : Books
From no-hitters to opening days to World Series: Jeff Nelson has seen it all as an MLB umpire, Local News
Ten MLB Umpires Retiring, Most Since 1999
Hallion, Tom - Umpire Ejection Fantasy League Portal
MLB Rumors: Ted Barrett & Greg Gibson Among 10 Umpires Retiring
Jackpot Umpire Tom Hallion Retires After Lengthy Career - Close Call Sports & Umpire Ejection Fantasy League
Tim McClelland - Wikipedia
A Major Loss Think Blue LA
1999 Baseball History - This Great Game
Top 30 Managers in Major League Baseball History