The Center for Barth Studies, The Theological University of the Protestant Church of The Netherlands and the Ruhr-Universität Bochum in Germany jointly co-host an online bibliography of Karl Barth
The online bibliography currently contains primary and secondary literature from 1997 to 2006. For bibliographic information prior to 1997, please consult the Bibliographie Karl Barth by Hans-Markus Wildi.
Special Collections at Princeton Theological Seminary also maintains a searchable database of the reviews and articles in the Karl Barth Collection. This database contains the items actually present in the collection.