- Author: Robert Bickers, Christian Henriot (editors)
- Language: English
- Year: 2017
- Author: Robert Peters, Christian Fischer, Norbert Nagel
- Language: German
- Year: 2017
- Author: Robert Peters, Christian Fischer, Norbert Nagel
- Language: German
- Year: 2017
- Author: Boncardo Robert, Gelder Christian R., Mallarmé Stéphane
- Language: English
- Year: 2017
- Author: Boncardo Robert, Gelder Christian R., Mallarmé Stéphane
- Language: English
- Year: 2017
- Author: Robert Kunkel Christian Parma
- Language: Polish
- Year: 2008
- Author: Wolfgang Becker Robert Holzmann Christian Hilmer (auth.)
- Language: German
- Year: 2016
- Author: Robert R. Christian
- Language: English
- Year: 1958
- Author: Robert Skidelsky Christian Westerlind Wigström (eds.)
- Language: English
- Year: 2010
- Author: Robert Grützmann Christian Pilarsky (eds.)
- Language: English
- Year: 2016