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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Variations pour une Porte et un Sourpir" with Karin von Aroldingen and John Clifford, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1974. https://qa-digitalcollections.nypl.org/items/972aabc0-d189-0137-a9d6-758e18114d3b
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Variations pour une Porte et un Sourpir" with Karin von Aroldingen and John Clifford, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/972aabc0-d189-0137-a9d6-758e18114d3b
Billy Rose Theatre Division, The New York Public Library. (1974). New York City Ballet production of "Variations pour une Porte et un Sourpir" with Karin von Aroldingen and John Clifford, choreography by George Balanchine (New York) Retrieved from https://qa-digitalcollections.nypl.org/items/972aabc0-d189-0137-a9d6-758e18114d3b
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/972aabc0-d189-0137-a9d6-758e18114d3b | title=
(still image)
New York City Ballet production of "Variations pour une Porte et un Sourpir" with Karin von Aroldingen and John Clifford, choreography by George Balanchine (New York), (1974)|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>