There are 6 other officials.
For a usual NFL game, the following are the seven assigned officials :
(see related link)
3 referees are in soccer and football
There are seven on field officials in an American football game: referee, umpire, head linesman, line judge, side judge, field judge, back judge. Click on the 'NFL Officials' link on this page to read about the duties that each official has during a game.
Because there is more pressure on the referees from the media and managers
There are 11 football players on each team and there is to teams. So all together there are 22 football players on the field and 4 referees.
usually 2. They stand at different sides of the court to one an other. One umpire controls one half and the other umpire controls the other half.
7 or 8 depending on tornament in the professionals including the chair umpire.
There are usually 6 line judges and 1 chair umpire.
i think there are four referees.
if you're talking about football (not American football) then there are 2 teams 11 players each |+ 3 or 5 referees
There are four referees in a baseball game.
Because each referee has a different viewing angle and can help catch fouls that the other referee didn't see and prevents false penalties from being called because one referee couldn't see the foul but rather assumed it. It also allows the referees to deliberate when a challenge is called and come up with a definitive answer which might be hard with only one or two referees.