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Manuscripts and Archives Division, The New York Public Library. "Markens, Isaac" The New York Public Library Digital Collections. 1906 - 1913. https://old-digitalcollections.nypl.org/items/cca0bd00-ae12-0135-7c43-08f41d08692a
Manuscripts and Archives Division, The New York Public Library. "Markens, Isaac" New York Public Library Digital Collections. Accessed November 2, 2026. https://old-digitalcollections.nypl.org/items/cca0bd00-ae12-0135-7c43-08f41d08692a
Manuscripts and Archives Division, The New York Public Library. (1906 - 1913). Markens, Isaac Retrieved from https://old-digitalcollections.nypl.org/items/cca0bd00-ae12-0135-7c43-08f41d08692a
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/cca0bd00-ae12-0135-7c43-08f41d08692a | title=
(text)
Markens, Isaac, (1906 - 1913)|author=Digital Collections, The New York Public Library |accessdate=November 2, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>