Steen, M. (2014). Verdi's Il Trovatore: A short guide to a great opera. Original Writing.
Lua i Stíl Chicago (17ú heag.)Steen, Michael. Verdi's Il Trovatore: A Short Guide to a Great Opera. Dublin, Ireland: Original Writing, 2014.
Lua MLA (9ú heag.)Steen, Michael. Verdi's Il Trovatore: A Short Guide to a Great Opera. Original Writing, 2014.
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