Umpire (baseball) - Wikipedia
11 HACKS FOR ONFIELD UMPIRES Texas Association of Sports Officials
Close Call Sports & Umpire Ejection Fantasy League: Rules 2.00 & 6.01(f): Umpire Interference
Baseball Rules in Black and White, High School - Batter's Interference Instructional Video.
Umpire Rules Intentional Interference - Baseball Rules Academy
Baseball Rules in Black and White, High School - Batter's Interference Instructional Video.
Baseball Rules Academy - The rules of baseball, explained
Baseball Rules Academy - The rules of baseball, explained
Rule books and regulations: Training to be a high school baseball umpire
New Twists for Umpire Interference - Baseball Rules Academy