Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
The Comedian Harmonists by Wittenbrink, Ħad 29 Jan 2012, Minn (2012/2012), Immexxi minn Sandra Wissmann,, Surmast Direttur Askan Geisler, Musiktheater im Revier, Gelsenkirchen, Germany