Here are some books I have found particularly helpful and some I have been told are wonderful and have yet to read!
Shepharding a Child's Heart, Ted Tripp
How to Really Love Your Child, Ross Campbell
Kids Who Follow, Kids Who Don't, Ross Campbell
Please Understand Me, Marilyn Bates and David Keirsey (Myers-Briggs model of personalities)
The Birth Order Book, Kevin Leman
The Five Love Languages of Children, Gary Chapman and Ross Campbell
Temper Your Child's Tantrums, James Dobson (he has many books!)
Exposing the Myths of Parenthood, David Jeremiah
When You Feel Like Screaming, Grace Ketterman and Pat Holt
Making Children Mind Without Losing Yours, Kevin Leman
The Difficult Child, Stanley Turecki
Siblings Without Rivalry, Faber and Mazlish
How to Talk so Your Kids Will Listen and Listen so Your Kids Will Talk, Faber and Mazlish
Different Children, Different Needs, Charles F. Boyd
Nurture by Nature, Tieger and Tieger
How to Development Your Child's Temperament, Beverly LaHaye