MLA
Tarr's Studio (New York, N.Y.). African American woman in a dress sitting on a chair with an infant sitting on her lap, with an African American woman and an African American girl standing next to her. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wnp-cor.
APA, 6th edition
Tarr's Studio (New York, N.Y.). (unknown)[African American woman in a dress sitting on a chair with an infant sitting on her lap, with an African American woman and an African American girl standing next to her]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wnp-cor.
Chicago
Tarr's Studio (New York, N.Y.), African American woman in a dress sitting on a chair with an infant sitting on her lap, with an African American woman and an African American girl standing next to her, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/24947d7wnp-cor.