Game Rules:
The playing rules of the PSA Baseball program shall be the Major League Baseball Official Rules as published on the MLB.com website, except as modified by PSA Local Rules.
Click here for PSA Baseball Rules (updated for 2012 Spring)
NTBA Rules:
NTBA League Rules
USSSA Rules
NTBA Playing Field and Equipment
USSSA 2011and 2012 Baseball Bat Performance Standards
MLB Rules:
http://mlb.mlb.com/mlb/official_info/official_rules/foreword.jsp