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Billy Rose Theatre Division, The New York Public Library. "John Cullum (L), Madeleine Kahn (C) and Imogene Coca (R) in a scene from the Broadway production of the musical "On The Twentieth Century"" The New York Public Library Digital Collections. 1978. https://digitalcollections.nypl.org/items/80f5e260-9216-0138-f1c4-0d3dc5ce87fc
Billy Rose Theatre Division, The New York Public Library. "John Cullum (L), Madeleine Kahn (C) and Imogene Coca (R) in a scene from the Broadway production of the musical "On The Twentieth Century"" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/80f5e260-9216-0138-f1c4-0d3dc5ce87fc
Billy Rose Theatre Division, The New York Public Library. (1978). John Cullum (L), Madeleine Kahn (C) and Imogene Coca (R) in a scene from the Broadway production of the musical "On The Twentieth Century" Retrieved from https://digitalcollections.nypl.org/items/80f5e260-9216-0138-f1c4-0d3dc5ce87fc
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/80f5e260-9216-0138-f1c4-0d3dc5ce87fc | title=
(still image)
John Cullum (L), Madeleine Kahn (C) and Imogene Coca (R) in a scene from the Broadway production of the musical "On The Twentieth Century", (1978)|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>