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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet Orthopedist Dr. William Hamilton, specialist in dance and sports related iinjuries (New York)" The New York Public Library Digital Collections. 1979. https://old-digitalcollections.nypl.org/items/e5704cd0-30a9-0138-cc18-099453f18f41
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet Orthopedist Dr. William Hamilton, specialist in dance and sports related iinjuries (New York)" New York Public Library Digital Collections. Accessed November 5, 2026. https://old-digitalcollections.nypl.org/items/e5704cd0-30a9-0138-cc18-099453f18f41
Billy Rose Theatre Division, The New York Public Library. (1979). New York City Ballet Orthopedist Dr. William Hamilton, specialist in dance and sports related iinjuries (New York) Retrieved from https://old-digitalcollections.nypl.org/items/e5704cd0-30a9-0138-cc18-099453f18f41
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New York City Ballet Orthopedist Dr. William Hamilton, specialist in dance and sports related iinjuries (New York), (1979)|author=Digital Collections, The New York Public Library |accessdate=November 5, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>