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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet rehearsal for "Vienna Waltzes" with George Balanchine with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1977. https://old-digitalcollections.nypl.org/items/7f0f2310-b856-0136-575e-29a217cf8177
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet rehearsal for "Vienna Waltzes" with George Balanchine with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed November 5, 2026. https://old-digitalcollections.nypl.org/items/7f0f2310-b856-0136-575e-29a217cf8177
Billy Rose Theatre Division, The New York Public Library. (1977). New York City Ballet rehearsal for "Vienna Waltzes" with George Balanchine with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York) Retrieved from https://old-digitalcollections.nypl.org/items/7f0f2310-b856-0136-575e-29a217cf8177
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/7f0f2310-b856-0136-575e-29a217cf8177 | title=
(still image)
New York City Ballet rehearsal for "Vienna Waltzes" with George Balanchine with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York), (1977)|author=Digital Collections, The New York Public Library |accessdate=November 5, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>