MLA
African American Woman Sitting on a Chair in a Dress, Holding a Baby Girl on Her Lap, with an African American Man in a Suit Standing next to Them. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/972p5hqc20-cor.
APA, 6th edition
African American woman sitting on a chair in a dress, holding a baby girl on her lap, with an African American man in a suit standing next to them (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqc20-cor.
Chicago
“African American Woman Sitting on a Chair in a Dress, Holding a Baby Girl on Her Lap, with an African American Man in a Suit Standing next to Them.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqc20-cor.