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Manuscripts and Archives Division, The New York Public Library. "Marden, Orison Swett" The New York Public Library Digital Collections. 1906. https://digitalcollections.nypl.org/items/801f5700-ae12-0135-999d-618fc45e9e3e
Manuscripts and Archives Division, The New York Public Library. "Marden, Orison Swett" New York Public Library Digital Collections. Accessed February 15, 2025. https://digitalcollections.nypl.org/items/801f5700-ae12-0135-999d-618fc45e9e3e
Manuscripts and Archives Division, The New York Public Library. (1906). Marden, Orison Swett Retrieved from https://digitalcollections.nypl.org/items/801f5700-ae12-0135-999d-618fc45e9e3e
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Marden, Orison Swett, (1906)|author=Digital Collections, The New York Public Library |accessdate=February 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>