- Author: Walter Freund
- Language: German
- Year: 1942
- Author: Donna L. Mohr, Rudolf Jakob Freund, William J. Wilson, Rudolf Jakob Freund
- Language: English
- Year: 2022
- Author: Julien Freund
- Language: French
- Year: 1966
- Author: Stefan Freund, Otto Steiger
- Language: German
- Author: Steven M. Freund Joy L. Starks
- Language: English
- Year: 2019
- Author: Julien Freund
- Language: Spanish
- Year: 1995
- Author: Rudolf Freund William Wilson
- Language: English
- Author: Freund Julien
- Language: French
- Author: Julien Freund
- Language: French
- Year: 1995
- Author: Donna L. Mohr William J. Wilson Rudolf J. Freund
- Language: English
- Year: 2021