- Author: Janusz Korczak, Elisabeth Heimpel, Hans Roos
- Language: German
- Year: 2016
- Author: Janusz Korczak, Elisabeth Heimpel, Hans Roos
- Language: German
- Year: 2016
- Author: Nugteren Hans Roos Marti.
- Language: Yugur
- Author: Nugteren Hans Roos Marti.
- Language: Western Yugur-English
- Author: Max Planck (auth.) Dr. Dr. Hans Roos Professor Dr. Armin Hermann (eds.)
- Language: German
- Year: 2001