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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet - rehearsal of "A Schubertiad" with Heather Watts, Bart Cook and Peter Martins, at left Maria Calegari and Joseph Duell, choreography by Peter Martins (New York)" The New York Public Library Digital Collections. 1983. https://digitalcollections.nypl.org/items/b0126aa0-cd97-0137-de9d-25b41e29f7b9
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet - rehearsal of "A Schubertiad" with Heather Watts, Bart Cook and Peter Martins, at left Maria Calegari and Joseph Duell, choreography by Peter Martins (New York)" New York Public Library Digital Collections. Accessed January 29, 2025. https://digitalcollections.nypl.org/items/b0126aa0-cd97-0137-de9d-25b41e29f7b9
Billy Rose Theatre Division, The New York Public Library. (1983). New York City Ballet - rehearsal of "A Schubertiad" with Heather Watts, Bart Cook and Peter Martins, at left Maria Calegari and Joseph Duell, choreography by Peter Martins (New York) Retrieved from https://digitalcollections.nypl.org/items/b0126aa0-cd97-0137-de9d-25b41e29f7b9
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/b0126aa0-cd97-0137-de9d-25b41e29f7b9 | title=
(still image)
New York City Ballet - rehearsal of "A Schubertiad" with Heather Watts, Bart Cook and Peter Martins, at left Maria Calegari and Joseph Duell, choreography by Peter Martins (New York), (1983)|author=Digital Collections, The New York Public Library |accessdate=January 29, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>