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Billy Rose Theatre Division, The New York Public Library. "Unidentified actress and Jack Cassidy sitting during rehearsals of It's a bird, it's a plane, it's Superman" The New York Public Library Digital Collections. 1840 - 2020. https://digitalcollections.nypl.org/items/ad9e4aa5-51db-60e5-e040-e00a18066d28
Billy Rose Theatre Division, The New York Public Library. "Unidentified actress and Jack Cassidy sitting during rehearsals of It's a bird, it's a plane, it's Superman" New York Public Library Digital Collections. Accessed April 20, 2024. https://digitalcollections.nypl.org/items/ad9e4aa5-51db-60e5-e040-e00a18066d28
Billy Rose Theatre Division, The New York Public Library. (1840 - 2020). Unidentified actress and Jack Cassidy sitting during rehearsals of It's a bird, it's a plane, it's Superman Retrieved from https://digitalcollections.nypl.org/items/ad9e4aa5-51db-60e5-e040-e00a18066d28
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/ad9e4aa5-51db-60e5-e040-e00a18066d28 | title=
(still image)
Unidentified actress and Jack Cassidy sitting during rehearsals of It's a bird, it's a plane, it's Superman, (1840 - 2020)|author=Digital Collections, The New York Public Library |accessdate=April 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>