The Duties of Parents by J C Ryle and published by Christian Reprint Series.
This little volume is one of the best encouragements toward Biblical parenting ever written. If you are not familiar with what J C Ryle says, we would encourage you buy it and spend an hour reading through it. You will be greatly rewarded!
As Ryle himself says in the introduction: "Reader, these things may well give rise to great searchings of heart. Suffer then a word of exhortation from a minister, about the right training of children. Believe me, the subject is one that should come home to every conscience, and make every one ask himself the question, "Am I in this matter doing what I can?"
"It is a subject that concerns almost all. There is hardly a household that it does not touch. Parents, nurses, teachers, godfathers, godmothers, uncles, aunts, brothers, sisters, — all have an interest in it. Few can be found, I think, who might not influence some parent in the management of his family, or affect the training of some child by suggestion or advice. All of us, I suspect, can do something here, either directly or indirectly, and I wish to stir up all to bear this in remembrance."