Cheri has put this on her blog, but I wanted to add my appreciative second to her choice of parenting book: 
The Power of Positive Parenting by Glenn I. Latham. He has other books which I love as well:
Christlike Parenting: Taking the Pain out of Parenting
Parenting with Love: Making a Difference in a Day
What’s a Parent to Do? Solving Family Problems in a Christlike Way
They were originally recommended to me by my friend Leslie. His books and insight were her touchstones as she parented her autistic son. She said many times that he saved her as a parent. When Dr. Latham passed away, she was really shaken because he had been kind enough to personally correspond with her about Lukas. To me they represent the best possible marriage of sound, scientifically based thought and the principles of the Gospel of Jesus Christ.
So anyway, to make a short story long, yesterday the last book saved me. I had a really difficult parenting situation facing me. I was angry, frustrated, resentful, feeling hopeless because it is a recurring problem, and I just wanted to scream. Instead, I prayed, found one of Dr. Latham’s books and started reading. The page I turned to had the insight and the perspective that I needed. He had scripts and roleplays that were, word for word, exactly like the things that were running through my mind. I had enough time before school got out to get myself together, and when the involved child and I talked about it, things went okay. We were able to figure out a solution and are on track for a much better outcome than the imagined one I was dreading yesterday. So, thanks to Dr. Latham, everything is okay today instead of our family being stuck in teenage door-slamming-freeze-out land. Of course the whole point is not changing the kid, but changing myself and the way I respond. So basic. So hard. I am so ready to trade in my natural woman. I know I need her to get where I want to be, but boy she is a pain in the neck sometimes.
My Red Door Days 