Interference (baseball) - Wikipedia
Old Acts, New Rulings - Referee.com
Obstruction vs. Interference: What's the Difference? - Baseball Rules Academy
Obstruction or Interference? You make the call - baseball rules. - YouTube
Cleveland scores winning run after Red Sox obstruction erases easy out
Interference (baseball) - Wikiwand
Defining Interference and Obstruction - Little League
Umpire Interference: An Easy Explanation – Baseball Training World
Obstruction A's Automatic Base Award - YouTube
:format(jpeg)/cdn.vox-cdn.com/uploads/chorus_image/image/21847903/20131026_ajl_ac1_390.0.jpg "World Series 2013: Jim Joyce had to call obstruction, because baseball isn't football - Viva El Birdos")
World Series 2013: Jim Joyce had to call obstruction, because baseball isn't football - Viva El Birdos
Defining Catcher's Interference - Little League
Obstruction on Pitcher, Interference on Batter-Runner, or Just Safe/Out? - YouTube
Offensive Interference
Little League Umpiring 101.com - visual training for beginning umpires - Obstruction and Interference
Close Call Sports & Umpire Ejection Fantasy League: Comparison - Infield Interference or Only Obstruction?
The MLB obstruction rule that ended Game 3 | For The Win
Playoff Prospectus: World Series Game Three Recap (The Call Edition) - Baseball ProspectusBaseball Prospectus
What is your call? Obstruction/Interference? Nothing? - YouTube
Interference or Obstruction - YouTube
Blocking the plate - Wikipedia
Baseball Rules Academy: So Explain This Obstruction Call — Inside the Seams
Cardinals walk off on obstruction call in Game 3 of the World Series - YouTube
Obstruction? Interference? Nothing? You Make the Call! - YouTube
Fair Or Foul? Baseball Expands Use Of Instant Replay : The Two-Way : NPR
/cdn.vox-cdn.com/uploads/chorus_asset/file/11838441/usa_today_10992401.jpg "Washington Nationals' Davey Martinez on interference call in 2-1 loss to Miami Marlins: “That was just a bad call. Period.” - Federal Baseball")