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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Duo Concertant" with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1974. https://digitalcollections.nypl.org/items/20e73770-d961-0137-70bc-37a86d2abfb0
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Duo Concertant" with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/20e73770-d961-0137-70bc-37a86d2abfb0
Billy Rose Theatre Division, The New York Public Library. (1974). New York City Ballet production of "Duo Concertant" with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York) Retrieved from https://digitalcollections.nypl.org/items/20e73770-d961-0137-70bc-37a86d2abfb0
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(still image)
New York City Ballet production of "Duo Concertant" with Kay Mazzo and Peter Martins, choreography by George Balanchine (New York), (1974)|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>