What position is harder than a catcher in baseball? - Quora
What do major league catchers do to keep their glove hand from being injured from all those 90 + mile pitches being thrown at them constantly? - Quora
Definition of the Little League® Strike Zone - Little League
Do baseball catchers have to be slow? - Quora
The Physics of Catchers' Knees
Amid Major Rule Changes, MLB Catchers Wary of Looming Robo-Umps – NBC Connecticut
Padres' Francisco Mejia takes a knee in battle for playing time at catcher - The San Diego Union-Tribune
Rays ignite new trend for catchers (Everyone thought they were crazy)
Blocking the plate - Wikipedia