Vincent, I., & Ivary, L. (2022). Overture of hope: Two sisters' daring plan that saved opera's jewish stars from the third reich (Unabridged.). Blackstone Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVincent, Isabel, और Liisa Ivary. Overture of Hope: Two Sisters' Daring Plan That Saved Opera's Jewish Stars from the Third Reich. Unabridged. Ashland: Blackstone Publishing, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रVincent, Isabel, और Liisa Ivary. Overture of Hope: Two Sisters' Daring Plan That Saved Opera's Jewish Stars from the Third Reich. Unabridged. Blackstone Publishing, 2022.
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