Three points keeps alive the Reds' hopes of automatic promotion while cementing firmly their place in the play-offs and assistant manager David Kelly called it 'thoroughly deserved'.
"The young players have come through and done really well," he told BBC Radio Nottingham.
Posh meanwhile have made life hard for a number of teams in recent weeks despite looking doomed to relegation.
Manager Jim Gannon felt his side 'looked the better football team' in the second half.
He commented: "Since I came to the club I have asked the players to be competitive and I've just tried to get the best out of them and show what they are made of.
"It's been all about credibility and pride."