Saper vorreste : un ballo in maschera, an opera in five acts : aria for soprano /

• 作者：Verdi ; Italian text with English adaptation by Humphrey Procter-Gregg
• 出版者：International Music Co
• 出版地：New York :
• 語文：義大利語
• 作者：VerdiGiuseppe;Procter-Gregg Humphrey