- Author: Rudolf Carnap
- Language: German
- Year: 1999
- Author: Edmund Husserl
- Language: German
- Year: 1992
- Author: Plato Klaus Reich (Hg.)
- Language: German
- Year: 1968
- Author: Rene Descartes
- Language: German
- Year: 2005
- Author: Georg Wilhelm Friedrich Hegel
- Language: English
- Year: 2008
- Author: Betrand Russel
- Language: German
- Year: 2007