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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Concerto for Two Solo Pianos, with Heather Watts and Ib Andersen, choreography by Peter Martins (New York)" The New York Public Library Digital Collections. 1982. https://qa-digitalcollections.nypl.org/items/90b9d1c0-c2bd-0137-ca78-6bb291627cd7
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet production of "Concerto for Two Solo Pianos, with Heather Watts and Ib Andersen, choreography by Peter Martins (New York)" New York Public Library Digital Collections. Accessed January 6, 2025. https://qa-digitalcollections.nypl.org/items/90b9d1c0-c2bd-0137-ca78-6bb291627cd7
Billy Rose Theatre Division, The New York Public Library. (1982). New York City Ballet production of "Concerto for Two Solo Pianos, with Heather Watts and Ib Andersen, choreography by Peter Martins (New York) Retrieved from https://qa-digitalcollections.nypl.org/items/90b9d1c0-c2bd-0137-ca78-6bb291627cd7
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/90b9d1c0-c2bd-0137-ca78-6bb291627cd7 | title=
(still image)
New York City Ballet production of "Concerto for Two Solo Pianos, with Heather Watts and Ib Andersen, choreography by Peter Martins (New York), (1982)|author=Digital Collections, The New York Public Library |accessdate=January 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>