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Billy Rose Theatre Division, The New York Public Library. "Dick Anthony Williams, Cleavon Little, Peter Masterson, Moses Gunn and Northern Calloway in the stage production The Poison Tree" The New York Public Library Digital Collections. 1976. https://digitalcollections.nypl.org/items/bdce2724-9a40-1d6d-e040-e00a18060571
Billy Rose Theatre Division, The New York Public Library. "Dick Anthony Williams, Cleavon Little, Peter Masterson, Moses Gunn and Northern Calloway in the stage production The Poison Tree" New York Public Library Digital Collections. Accessed March 19, 2025. https://digitalcollections.nypl.org/items/bdce2724-9a40-1d6d-e040-e00a18060571
Billy Rose Theatre Division, The New York Public Library. (1976). Dick Anthony Williams, Cleavon Little, Peter Masterson, Moses Gunn and Northern Calloway in the stage production The Poison Tree Retrieved from https://digitalcollections.nypl.org/items/bdce2724-9a40-1d6d-e040-e00a18060571
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(still image)
Dick Anthony Williams, Cleavon Little, Peter Masterson, Moses Gunn and Northern Calloway in the stage production The Poison Tree, (1976)|author=Digital Collections, The New York Public Library |accessdate=March 19, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>