Burtrand World: Offside Rule
A simple explanation of the offside rule and the offside trap with the use of diagrams.

FIFA.com: Laws of the Game
The rules of the sport as authorised by the International Football Association Board (IFAB). The members of the IFAB are, The Football Association (England), the Scottish Football Association, the Football Association of Wales, the Irish Football Association, and FIFA.

Soccer Referee Info
A collection of links for known sources of laws, advice, training material and leagues. Geared at the developing referee who wants to learn more.

Soccer Rules Page
The laws explained, with information about teams, tournaments, referees, and the pitch.