ICC scraps soft-signal rule for contentious catches
Umpires
Umpire Information - Rules and Tools
We May Never Find Out How Good Umpires Can Be
Phillies' Thomson ejected after pitch clock doesn't reset for Nola
Has Expanded Replay Worked Well In Baseball? Here's Our Call
The Umpire Strikes Back - WSJ
Red Diamond Industries: Baseball Umpire Pocket Reference