You are the Ref: The Ultimate Illustrated Guide to the Laws of Football
PAUL TREVILLION is the author of over twenty books. His work is avidly collected by sporting professionals and fans alike.KEITH HACKETT is an English former football referee, who began refereeing in local leagues in the Sheffield, Yorkshire, area in 1960. He is the former head of Premier League referees and has been collaborating with Paul Trevillion since the 70s.