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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet rehearsal of "Who Cares" with Merrill Ashley and Deborah Koolish watching, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1970. https://old-digitalcollections.nypl.org/items/1c9ab4a0-550d-0135-b781-636cf8279d16
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet rehearsal of "Who Cares" with Merrill Ashley and Deborah Koolish watching, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed November 1, 2026. https://old-digitalcollections.nypl.org/items/1c9ab4a0-550d-0135-b781-636cf8279d16
Billy Rose Theatre Division, The New York Public Library. (1970). New York City Ballet rehearsal of "Who Cares" with Merrill Ashley and Deborah Koolish watching, choreography by George Balanchine (New York) Retrieved from https://old-digitalcollections.nypl.org/items/1c9ab4a0-550d-0135-b781-636cf8279d16
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(still image)
New York City Ballet rehearsal of "Who Cares" with Merrill Ashley and Deborah Koolish watching, choreography by George Balanchine (New York), (1970)|author=Digital Collections, The New York Public Library |accessdate=November 1, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>