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Rangers vs Celtic: Bobby Madden appointed as referee for Old Firm clash | Football News | Sky Sports
Bobby Madden: Scottish Fifa official joins English referee ranks - BBC Sport
Rangers and Celtic fans react on Twitter to Bobby Madden being named as referee
Bobby Madden to referee Rangers v Celtic Scottish Cup clash at Hampden
Old Firm referee Bobby Madden's Wikipedia page changed to claim he helped the 'Orange b******* cheat' after Celtic v Rangers match – The Scottish Sun | The Scottish Sun