Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
Bulgarians From Olden Times by Karastoyanov, Sib 06 Lul 2013, Minn (2012/2013), Immexxi minn Nikolay Aprilov,, Surmast Direttur Krasimir Kashev, State Opera Stara Zagora, Stara Zagora, Bulgaria