Zdroje
https://referaty.hladas.sk/referat.php/historia-opery/23/20304
https://sk.wikipedia.org/wiki/Andrea_Bocelli
https://skolskyservis.teraz.sk/zaujimavosti/slavny-operny-spevak-andrea-bocelli-m/44352-clanok.html
https://i.ytimg.com/vi/QDsEjRwMMZc/maxresdefault.jpg
https://upload.wikimedia.org/wikipedia/it/thumb/1/13/GFMalipiero55.jpg/220px-GFMalipiero55.jpg
https://sk.wikipedia.org/wiki/Claudio_Monteverdi
https://i.pinimg.com/originals/70/be/b8/70beb860df199c9a780a10570a0a34a1.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/1/12/Dvorak.jpg/230px-Dvorak.jpg
https://referaty.aktuality.sk/opera/referat-18283
https://www.youtube.com/watch?v=ChcR2gKt5WM
https://www.tyden.cz/obrazek/201809/5b9b3d7692863/crop-1621609-libuse.jpg
https://sk.wikipedia.org/wiki/Opera
https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Beethoven.jpg/230px-Beethoven.jpg