Ray S. Anderson 
Theological Foundations for Ministry [PDF ebook] 

This is a collection of essential passages on the ministry of the church. By selecting significant sources which share a common assumption concerning the nature of theology and its methodology, the editor presents a single consistent theology of ministry. The book is carefully organised to allow a thorough exploration of the different aspects of ministry. Contributors include Karl Barth, Dietrich Bonhoeffer, Hans Küng, Helmut Thielicke and Thomas F. Torrance.