Matthias Media called 'Facing Depression Together'. It's a very helpful booklet, and it only costs $2.50.
"Depression is a black pit for the sufferers and no fun for the carers. But on this side of Jesus’ return, it will continue to be a feature of church life. This MiniZine is designed to help churches and Bible study groups talk about the issues involved with facing depression and anxiety as Christians, and reflect on them from the perspective of God’s gospel.These articles will encourage all involved to keep looking to God and acting with grace and wisdom in the face of discouragement and despair."