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Billy Rose Theatre Division, The New York Public Library. "Hal Holbrook preparing for the stage performance in Mark Twain Tonight! 1966" The New York Public Library Digital Collections. 1966. https://digitalcollections.nypl.org/items/93ad2110-42dd-0130-e196-58d385a7b928
Billy Rose Theatre Division, The New York Public Library. "Hal Holbrook preparing for the stage performance in Mark Twain Tonight! 1966" New York Public Library Digital Collections. Accessed January 31, 2025. https://digitalcollections.nypl.org/items/93ad2110-42dd-0130-e196-58d385a7b928
Billy Rose Theatre Division, The New York Public Library. (1966). Hal Holbrook preparing for the stage performance in Mark Twain Tonight! 1966 Retrieved from https://digitalcollections.nypl.org/items/93ad2110-42dd-0130-e196-58d385a7b928
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/93ad2110-42dd-0130-e196-58d385a7b928 | title=
(still image)
Hal Holbrook preparing for the stage performance in Mark Twain Tonight! 1966, (1966)|author=Digital Collections, The New York Public Library |accessdate=January 31, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>