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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "The Cage"; Karin von Aroldingen warms up backstage, choreography by Jerome Robbins (New York)" The New York Public Library Digital Collections. 1964. https://old-digitalcollections.nypl.org/items/9f675e20-4651-0136-ccb6-6beb72bf27d9
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "The Cage"; Karin von Aroldingen warms up backstage, choreography by Jerome Robbins (New York)" New York Public Library Digital Collections. Accessed October 25, 2026. https://old-digitalcollections.nypl.org/items/9f675e20-4651-0136-ccb6-6beb72bf27d9
Billy Rose Theatre Division, The New York Public Library. (1964). New York City Ballet production of "The Cage"; Karin von Aroldingen warms up backstage, choreography by Jerome Robbins (New York) Retrieved from https://old-digitalcollections.nypl.org/items/9f675e20-4651-0136-ccb6-6beb72bf27d9
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/9f675e20-4651-0136-ccb6-6beb72bf27d9 | title=
(still image)
New York City Ballet production of "The Cage"; Karin von Aroldingen warms up backstage, choreography by Jerome Robbins (New York), (1964)|author=Digital Collections, The New York Public Library |accessdate=October 25, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>