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Jerome Robbins Dance Division, The New York Public Library. "William (Bill) Earl in costume for "La Sonnambula"" The New York Public Library Digital Collections. 1960. https://digitalcollections.nypl.org/items/0133c330-e281-0135-173c-2792ec58ad5a
Jerome Robbins Dance Division, The New York Public Library. "William (Bill) Earl in costume for "La Sonnambula"" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/0133c330-e281-0135-173c-2792ec58ad5a
Jerome Robbins Dance Division, The New York Public Library. (1960). William (Bill) Earl in costume for "La Sonnambula" Retrieved from https://digitalcollections.nypl.org/items/0133c330-e281-0135-173c-2792ec58ad5a
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/0133c330-e281-0135-173c-2792ec58ad5a | title=
(still image)
William (Bill) Earl in costume for "La Sonnambula", (1960)|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>