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Billy Rose Theatre Division, The New York Public Library. "Autographed publicity photograph of George M. Cohan, inscribed "Yankee doodlefully yours"" The New York Public Library Digital Collections. 1904 - 1910. https://old-digitalcollections.nypl.org/items/2b12ff20-51fa-013a-0a56-0242ac110003
Billy Rose Theatre Division, The New York Public Library. "Autographed publicity photograph of George M. Cohan, inscribed "Yankee doodlefully yours"" New York Public Library Digital Collections. Accessed November 3, 2026. https://old-digitalcollections.nypl.org/items/2b12ff20-51fa-013a-0a56-0242ac110003
Billy Rose Theatre Division, The New York Public Library. (1904 - 1910). Autographed publicity photograph of George M. Cohan, inscribed "Yankee doodlefully yours" Retrieved from https://old-digitalcollections.nypl.org/items/2b12ff20-51fa-013a-0a56-0242ac110003
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/2b12ff20-51fa-013a-0a56-0242ac110003 | title=
(still image)
Autographed publicity photograph of George M. Cohan, inscribed "Yankee doodlefully yours", (1904 - 1910)|author=Digital Collections, The New York Public Library |accessdate=November 3, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>