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Billy Rose Theatre Division, The New York Public Library. "The sign of the four. Adapted from the novel by A. Conan Doyle" The New York Public Library Digital Collections. 1903. https://digitalcollections.nypl.org/items/e18007e0-1bc1-0130-7d1c-58d385a7b928
Billy Rose Theatre Division, The New York Public Library. "The sign of the four. Adapted from the novel by A. Conan Doyle" New York Public Library Digital Collections. Accessed August 17, 2022. https://digitalcollections.nypl.org/items/e18007e0-1bc1-0130-7d1c-58d385a7b928
Billy Rose Theatre Division, The New York Public Library. (1903). The sign of the four. Adapted from the novel by A. Conan Doyle Retrieved from https://digitalcollections.nypl.org/items/e18007e0-1bc1-0130-7d1c-58d385a7b928
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