Laws of the Game

Ask The Ref Soccer Rules Explained
Answers to questions regarding soccer rules provided by an International panel of certified referees.
http://www.asktheref.com/

Burtrand World: Offside Rule
A simple explanation of the offside rule and the offside trap with the use of diagrams.
http://www.offside-ref.co.uk/laws/11-offside-rule/detailed/

International Football Association Board
The body that determines the Laws of the Game. The board is made up from four FIFA representatives, and one representative each from England, Northern Ireland, Scotland and Wales.
http://en.wikipedia.org/wiki/International_Football_Association_Board

Sheffield Rules
The rules were a code of football devised and played in the English city of Sheffield between 1857 and 1878.
http://en.wikipedia.org/wiki/Sheffield_rules

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.
http://socref.net/