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© The New York Public Library, 2026
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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet dancer demonstrating the fourth position of the feet (New York)" The New York Public Library Digital Collections. 1979. https://old-digitalcollections.nypl.org/items/d7149250-30a9-0138-9363-49fcb63cae90
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet dancer demonstrating the fourth position of the feet (New York)" New York Public Library Digital Collections. Accessed November 5, 2026. https://old-digitalcollections.nypl.org/items/d7149250-30a9-0138-9363-49fcb63cae90
Billy Rose Theatre Division, The New York Public Library. (1979). New York City Ballet dancer demonstrating the fourth position of the feet (New York) Retrieved from https://old-digitalcollections.nypl.org/items/d7149250-30a9-0138-9363-49fcb63cae90
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(still image)
New York City Ballet dancer demonstrating the fourth position of the feet (New York), (1979)|author=Digital Collections, The New York Public Library |accessdate=November 5, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>