College baseball: Video review challenge system approved | NCAA.com
How Well Do You Know Baseball Rules?? - Referee.com
Baseball Challenge | Board Game | BoardGameGeek
Amazon.com: Baseball's Diamond Challenge - Learn the Rules to Some of the Most Puzzling Plays in the Game [DVD] : Jim Evans, Jim Evans, Jim Evans: Movies & TV
Game Rules
Buck Showalter knows pitchers lack control under new MLB rules
NEW REPLAY RULES, CHALLENGE SYSTEM IN EFFECT FOR SEC BASEBALL GAMES - College Baseball Daily