The WSF has prepared these guidelines to assist those
responsible for the organisation of officials at major
tournaments. A Tournament Referee and/or Tournament
Director of any tournament may use it as a checklist,
whether that event is international, national, regional,
local, or club level.
A new version of the TRG (PDF file) is on US Squash. The link to the WSF online version was removed. I have preserved that link here.