Referees Tab.
On the 5th February, FIFA released a list of match officials who have been chosen to referee the 64 matches of the tournament.
They didn't just release the names of the referees however, they released thirty "Trios" of names consisting of a referee and two assistants who will work together throughout the tournament.
The referees view.
This view lists the referee and his two chosen assistants sorted by confederation.
Tap on any 'trio row' to see the mobile Wiki page for the chosen referee.
The referees Wiki view.
Here we see the Wiki page for Saudi referee Khalil Al Ghamdi.