An optical system developed in Norway which makes judging offside easier. Diagrams, reports, testing, and contact details.

The overseas branch of the US Soccer federation referees in Yokosuka Japan.

This site is visited by referees from around the world. The forum is especially popular, with discussions on a variety of topics going on all the time.

An organisation for the international exchange of referees for youth tournaments.

An anonymous blog from a referee about games, situations, and problems.