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web.archive.org
Charlotte Greenspan (2009). "Estelle Liebling: 1880 – 1970". The Encyclopedia of Jewish Women. Archived from the original on May 12, 2021. Retrieved May 12, 2021.
Aaron I. Cohen (1987). "Liebling, Estelle". International encyclopedia of women composers. Archived from the original on May 20, 2021. Retrieved May 20, 2021.
"Estelle Liebling". Metropolitan Opera Archives. Archived from the original on August 12, 2018. Retrieved May 11, 2021.