Opposing Viewpoints Resource Center is a comprehensive full-text database that provides a wide scope of knowledge for nearly 5,000 current social topics in the forms of primary source documents, statistics, websites and multimedia, including its viewpoint articles that present the pros and cons of the issue. This database also includes a language translator which allows documents to be converted into eight different languages.
M. Gelzer. Vom Wesen und Wandel der Kirche. Zum siebzigsten Geburtstag von Eberhard Vischer herausgegeben von der Theologischen Fakultät der Universität Basel, Basel, (1935)