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Billy Rose Theatre Division, The New York Public Library. "New York City Ballet Production of "Agon" with (L-R) Susan Freedman, Jean-Pierre Frohlich and Wilhelmina Frankfurt, choreography by George Balanchine (New York)" The New York Public Library Digital Collections. 1982. https://old-digitalcollections.nypl.org/items/5a693950-5018-0133-39aa-00505686d14e
Billy Rose Theatre Division, The New York Public Library. "New York City Ballet Production of "Agon" with (L-R) Susan Freedman, Jean-Pierre Frohlich and Wilhelmina Frankfurt, choreography by George Balanchine (New York)" New York Public Library Digital Collections. Accessed October 17, 2026. https://old-digitalcollections.nypl.org/items/5a693950-5018-0133-39aa-00505686d14e
Billy Rose Theatre Division, The New York Public Library. (1982). New York City Ballet Production of "Agon" with (L-R) Susan Freedman, Jean-Pierre Frohlich and Wilhelmina Frankfurt, choreography by George Balanchine (New York) Retrieved from https://old-digitalcollections.nypl.org/items/5a693950-5018-0133-39aa-00505686d14e
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/5a693950-5018-0133-39aa-00505686d14e | title=
(still image)
New York City Ballet Production of "Agon" with (L-R) Susan Freedman, Jean-Pierre Frohlich and Wilhelmina Frankfurt, choreography by George Balanchine (New York), (1982)|author=Digital Collections, The New York Public Library |accessdate=October 17, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>