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Referee shirt colour matching with teams' - football match officials
How Much Do World Cup Referees Run During Matches?
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
Along With Black, MLS Refs to Wear Yellow, Blue and Pink Uniforms in '23, '24 – SportsLogos.Net News
Full referee list for Qatar 2022 World Cup confirmed as six female match officials appointed in historic move
OUR GAME: One color rises above the rest for success in soccer – Red – goalWA.net Archive
Soccer News: Brazilian Soccer Referee Says He Is Gay, Hopes to Inspire Others – NBC4 Washington
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
Referee myth-busting: How many decisions do officials get right?, Football News
Tackling the referee shortage: NCHSAA study recommends better pay, more penalties for poor sportsmanship.