Home › Authors › David Guretzki 👤 David Guretzki 5 books Books by David Guretzki An explorer's guide to Karl Barth 2016 Explorer's Guide to Karl Barth Explorer's Guide to Karl Barth 2016 Karl Barth on the Filioque. Da Karl Barth on the Filioque. David Guretzki 2016 Pocket dictionary of theological terms 2010 Karl Barth on the Filioque 2009