Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
The Opera Ball by Heuberger, Ħad 21 Jan 2007, Minn (2007/2007), Immexxi minn Josef Ernst Köpplinger,, Surmast Direttur Andreas Kowalewitz, Adrian Müller, Gärtnerplatztheater, Munich, Germany