This week’s text in Galatians focuses on adoption, God’s adoption of sinners as His sons as a result of Jesus’ work of redemption for us. J.I. Packer comments that you can’t really understand Christianity unless you understand adoption. John Calvin says you aren’t really a Christian unless, by the work of the Spirit, you call God your Father.
There are not many books on this topic. It is a much neglected topic- but there are a few great books just the same.
Great Books I’ve Read:
Children of the Living God: Delighting in the Father’s Love by Sinclair Ferguson. It is not a big book, but it is a great book. Ferguson does what Ferguson does best, put the cookies on the shelf so lesser beings can enjoy them. I can’t recommend this book enough.
Adopted by God: From Wayward Sinners to Cherished Children by Robert Peterson. It comes recommended by Packer, Ferguson, and Steve Brown among others. It is a very good book.
Knowing God by J.I. Packer. Though not on the topic of adoption, there is a great chapter on the topic. This is one of the great books which influenced me as a young Christian. That chapter is just one of the reasons.
Redemption Accomplished and Applied by John Murray. He includes a chapter on adoption as one aspect of the application of our redemption.
Books I’d Like to Read:
Adopted into God’s Family: Exploring a Pauline Metaphor by Trevor Burke. Part of the New Studies in Biblical Theology Series, this is a more academic look at this topic (which exceeds use by Paul).
Heirs with Christ: Puritans on Adoption by Joel Beeke. That should be an interesting read.
John Calvin and the Good News of Adoption by Timothy Trumper. It is 2 CDs with lectures by Trumper. Interesting…
Cavman Considers 
Great list! I was not aware of the Trumper CD’s! Very interesting indeed.
Here are a few more – http://www.togetherforadoption.org/?page_id=26