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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. "Marta Witkowska, Polish contralto seen recently with the Chicago-Philadelphia Opera Co. in Aida" The New York Public Library Digital Collections. 1912-07. https://digitalcollections.nypl.org/items/510d47e1-0e66-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. "Marta Witkowska, Polish contralto seen recently with the Chicago-Philadelphia Opera Co. in Aida" New York Public Library Digital Collections. Accessed May 1, 2024. https://digitalcollections.nypl.org/items/510d47e1-0e66-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. (1912-07). Marta Witkowska, Polish contralto seen recently with the Chicago-Philadelphia Opera Co. in Aida Retrieved from https://digitalcollections.nypl.org/items/510d47e1-0e66-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e1-0e66-a3d9-e040-e00a18064a99 | title=
(still image)
Marta Witkowska, Polish contralto seen recently with the Chicago-Philadelphia Opera Co. in Aida, (1912-07)
|author=Digital Collections, The New York Public Library |accessdate=May 1, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>