Wells' treble in the 3-1 win helped lift Parkinson's side up to 18th in the table, nine points clear of the relegation zone.
"We've got three games to go and we want to take that type of performance into all three of them," said Parkinson.
"We knew Northampton were fast starters so we couldn't afford to wait for them to start playing before us. They are the in-form team and I impressed upon the players the need to compete from the start.
"Nahki (Wells) scored three great goals for us - he's a cool finisher - and his third goal came at just the right time after they had pulled one back."
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