Steen, M. (2014). Verdi's Il Trovatore: A short guide to a great opera. Original Writing.
芝加哥风格引文Steen, Michael. Verdi's Il Trovatore: A Short Guide to a Great Opera. Dublin, Ireland: Original Writing, 2014.
MLA引文Steen, Michael. Verdi's Il Trovatore: A Short Guide to a Great Opera. Original Writing, 2014.
警告：这些引文格式不一定是100％准确.