Autore:Joseph Victor Widmann
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/67/Dr_Joseph_Victor_Widmann_-_1891_%28cropped%29.jpg/140px-Dr_Joseph_Victor_Widmann_-_1891_%28cropped%29.jpg)
- ↑ 1,0 1,1 Gemeinsame Normdatei
- ↑ 2,0 2,1 data.bnf.fr
- ↑ 3,0 3,1 Encyclopædia Britannica
- ↑ 4,0 4,1 International Music Score Library Project
- ↑ 5,0 5,1 Theaterlexikon der Schweiz
- ↑ Authority file della Biblioteca Nazionale Ceca
- ↑ The Fine Art Archive