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Billy Rose Theatre Division, The New York Public Library. "Margaret Wood and Earle Sieveling in the New York City Ballet production of Balanchine's "Ballet Imperial"" The New York Public Library Digital Collections. 1964. https://old-digitalcollections.nypl.org/items/ecf91330-b08a-0137-8ab7-0fafce8e3689
Billy Rose Theatre Division, The New York Public Library. "Margaret Wood and Earle Sieveling in the New York City Ballet production of Balanchine's "Ballet Imperial"" New York Public Library Digital Collections. Accessed September 29, 2026. https://old-digitalcollections.nypl.org/items/ecf91330-b08a-0137-8ab7-0fafce8e3689
Billy Rose Theatre Division, The New York Public Library. (1964). Margaret Wood and Earle Sieveling in the New York City Ballet production of Balanchine's "Ballet Imperial" Retrieved from https://old-digitalcollections.nypl.org/items/ecf91330-b08a-0137-8ab7-0fafce8e3689
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/ecf91330-b08a-0137-8ab7-0fafce8e3689 | title=
(still image)
Margaret Wood and Earle Sieveling in the New York City Ballet production of Balanchine's "Ballet Imperial", (1964)|author=Digital Collections, The New York Public Library |accessdate=September 29, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>