D.M.
I highly recommend the Love and Logic series. I used their books for educators when I was a full-time teacher and was very impressed. I then recommended their parenting materials to all my new mommy friends, and just about all of them love these books. Their book "Love and Logic Magic for Early Childhood" is very user-friendly, clear to understand, and has great examples to follow. Their website is http://www.loveandlogic.com/ (If you decide to buy any of their books though, they are typically $10 cheaper on Amazon).
Good luck with whatever you do!