The Baseball Analysts: Change-Up Archives
MLB makes rule on home plate collisions after umpire mistake in
Peter Dreier, Robert Elias - Baseball Rebels - The Players, People
Obstruction call becomes talk of baseball world – The Mercury
MLB obstruction rule: Explaining Cardinals' freak Game 3 win
With Umpires in the Outfield Come Postseason Errors in Judgment
MLB's new home plate collision rule won't be big adjustment, NY
Mariano Rivera Yankee Yapping
What is baseball's obstruction rule? - Missourinet
With MLB instant replay rule, announcers and umpires on the spot