Nahki Wells was on target in Bradford City's biggest win of the season with victory against Crewe Alexandra at home.Wells gave the Bantams an early lead after David Artell's defensive header ricocheted off the Bermuda striker past Steve Phillips in the Crewe goal.The 21-year-old has now scored three goals since joining Bradford at the start of the season.Crewe's Lee Bell hit the underside of the crossbar from the penalty spot and striker James Hanson punished the visitors by hammering in a low shot.Hanson made it 3-0 when he turned in Luke Oliver's flick on from 10 yards..