Poisoned Pawn Variation

Hey guys, I need help. I am a 2000 USCF rated player and I play the Najdorf for black. I am thinking of changing my variation from playing e6 to Qb6. ( The Poisoned Pawn Variation. ) Do any of you know any books or anything that can help me improve my knowlege in that area? Please give me your answers, thank you.