USAV and other rule sets are available in the Rules section.
Publications dealing with rule changes and officiating techniques:
The Official Word
The Official Word is a publication that contains current information for volleyball officials on topics such as rule changes, officiating techniques, upcoming events, and opportunities for rating and training. It is published as a joint effort between the USA Volleyball Officials Division and the Professional Association of Volleyball Officials (PAVO). The Official Word is published five times a year and is sent to all National and Junior National referees and scorekeepers.