Christianity Today just reviewed this book, Orphanology, by Tony Merida and Rick Morton, it received 5 stars. I bought it and have started reading it. You will want to get your hands on a copy. Here is what they said, ""adoption and orphan care is not just another fad movement but a robust response to God's first love of us. Christians approach orphan care not as mere humanitarians but as people adopted by God through the work of Jesus Christ."
In his introduction, Tony writes," Adoption is a real-life illustration of the gospel.It shows us how God transfoms spiritual orphans into family members. He changes our names, identities, and families by His grace. Orphan care is acts of mercy that flow from the heart of one who has been changed by the gospel."