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Billy Rose Theatre Division, The New York Public Library. "Laurence Langner and Theresa Helburn, administrators of all Theatre Guild production policies." The New York Public Library Digital Collections. 1840 - 2020. https://digitalcollections.nypl.org/items/853ac822-9f18-e701-e040-e00a18061095
Billy Rose Theatre Division, The New York Public Library. "Laurence Langner and Theresa Helburn, administrators of all Theatre Guild production policies." New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/853ac822-9f18-e701-e040-e00a18061095
Billy Rose Theatre Division, The New York Public Library. (1840 - 2020). Laurence Langner and Theresa Helburn, administrators of all Theatre Guild production policies. Retrieved from https://digitalcollections.nypl.org/items/853ac822-9f18-e701-e040-e00a18061095
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Laurence Langner and Theresa Helburn, administrators of all Theatre Guild production policies., (1840 - 2020)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>