- Author: Paul Janssen
- Language: German
- Year: 2016
- Author: Paul Janssen (auth.)
- Language: German
- Year: 1970
- Author: Paul Janssen (auth.) Paul Janssen (eds.)
- Language: German
- Year: 1974
- Author: Edmund Husserl (auth.) Paul Janssen (eds.)
- Language: German
- Year: 1977
- Author: Luc Duchateau Paul Janssen (auth.)
- Language: English
- Year: 2008