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Billy Rose Theatre Division, The New York Public Library. "Publicity photograph of Helmar Cooper and Bruce Wallace for the stage production A Black Mass by Amiri Baraka" The New York Public Library Digital Collections. 1972. https://qa-digitalcollections.nypl.org/items/1656ee70-04a7-013d-303c-0242ac110003
Billy Rose Theatre Division, The New York Public Library. "Publicity photograph of Helmar Cooper and Bruce Wallace for the stage production A Black Mass by Amiri Baraka" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/1656ee70-04a7-013d-303c-0242ac110003
Billy Rose Theatre Division, The New York Public Library. (1972). Publicity photograph of Helmar Cooper and Bruce Wallace for the stage production A Black Mass by Amiri Baraka Retrieved from https://qa-digitalcollections.nypl.org/items/1656ee70-04a7-013d-303c-0242ac110003
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/1656ee70-04a7-013d-303c-0242ac110003 | title=
(still image)
Publicity photograph of Helmar Cooper and Bruce Wallace for the stage production A Black Mass by Amiri Baraka, (1972)|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>