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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Tchaikovsky Pas de Deux" with Gelsey Kirkland and Helgi Tomasson, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1974. https://digitalcollections.nypl.org/items/501db140-b301-0137-06c0-6949b5b36b97
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Tchaikovsky Pas de Deux" with Gelsey Kirkland and Helgi Tomasson, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/501db140-b301-0137-06c0-6949b5b36b97
Billy Rose Theatre Division, The New York Public Library. (1974). New York City Ballet production of "Tchaikovsky Pas de Deux" with Gelsey Kirkland and Helgi Tomasson, choreography by George Balanchine (New York) Retrieved from https://digitalcollections.nypl.org/items/501db140-b301-0137-06c0-6949b5b36b97
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/501db140-b301-0137-06c0-6949b5b36b97 | title=
(still image)
New York City Ballet production of "Tchaikovsky Pas de Deux" with Gelsey Kirkland and Helgi Tomasson, choreography by George Balanchine (New York), (1974)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>