MLA
Ellis, W. M. African American Woman Sitting on a Chair with Her Legs Crossed, Wearing a Dress, and Reading a Book. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/764gmsbcf3-cor.
APA, 6th edition
Ellis, W. M. African American woman sitting on a chair with her legs crossed, wearing a dress, and reading a book (Box 73) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/764gmsbcf3-cor.
Chicago
Ellis, W. M. “African American Woman Sitting on a Chair with Her Legs Crossed, Wearing a Dress, and Reading a Book.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/764gmsbcf3-cor.