Parenting by God’s Promises: How to Raise Children in the Covenant of Grace by Joel Beeke is one of the books I would recommend for Christian parents. You can purchase a hard or electronic copy online. You can also listen to the message from the book below:
J.C. Ryle’s “Six Duties of Parents” is another resource I would recommend. You can accesses it here
This is also a good article on parenting. The Missing Ingredient in our Parenting.