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Billy Rose Theatre Division, The New York Public Library. "Publicity photo of Milton "Zeppo" Marx, Julius "Groucho" Marx, Leonard "Chico" Marx, and Arthur "Harpo" Marx in the motion picture The Cocoanuts." The New York Public Library Digital Collections. 1929. https://qa-digitalcollections.nypl.org/items/9ec72e41-ffc6-c5cb-e040-e00a180671a5
Billy Rose Theatre Division, The New York Public Library. "Publicity photo of Milton "Zeppo" Marx, Julius "Groucho" Marx, Leonard "Chico" Marx, and Arthur "Harpo" Marx in the motion picture The Cocoanuts." New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/9ec72e41-ffc6-c5cb-e040-e00a180671a5
Billy Rose Theatre Division, The New York Public Library. (1929). Publicity photo of Milton "Zeppo" Marx, Julius "Groucho" Marx, Leonard "Chico" Marx, and Arthur "Harpo" Marx in the motion picture The Cocoanuts. Retrieved from https://qa-digitalcollections.nypl.org/items/9ec72e41-ffc6-c5cb-e040-e00a180671a5
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/9ec72e41-ffc6-c5cb-e040-e00a180671a5 | title=
(still image)
Publicity photo of Milton "Zeppo" Marx, Julius "Groucho" Marx, Leonard "Chico" Marx, and Arthur "Harpo" Marx in the motion picture The Cocoanuts., (1929)|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>