New rules could drastically alter look, length of MLB games - The San Diego Union-Tribune
Training Umpires Part 2: Rules of the Game - UmpireBible
The Unwritten Rules of Baseball : The Etiquette, Conventional Wisdom, and Axiomatic Codes of Our National Pastime by Paul Dickson (2009, Hardcover) for sale online | eBay
Baseball rules - Wikipedia
Inside MLB clubhouse etiquette and what's off limits
Southland Baseball NZ - Baseball Etiquette
The Rules of Baseball Explained by a Former Pro
Unwritten rules of baseball - Wikipedia
The Guide to Understanding Baseball Rules and Regulations | SportsEdTV
Jim Henneman: New Baseball Rules? A Lot Of Work To Do And Habits To Break - PressBox