From Citizendium, the Citizens' Compendium
- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
- Major League Baseball homepage
- The Baseball Almanac - large database of baseball facts and history
- Ken Burns' Baseball at PBS - Information on Ken Burns' award winning documentary Baseball
- Major League Baseball Official Rules - also includes early versions of the rules and an historical timeline of changes to the rules.
- 2009 NCAA rules of baseball - PDF file
- MLB and high school baseball rules compared - high school game is governed by the National Federation of State High School Associations (NFSA)