MLA
The Rousseau Family of Musicians, Singers and Elocutionists Sitting in Chairs, Holding Guitars and Mandolins. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/931qfttf1r-cor.
APA, 6th edition
The Rousseau family of musicians, singers and elocutionists sitting in chairs, holding guitars and mandolins (Box 70). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/931qfttf1r-cor.
Chicago
“The Rousseau Family of Musicians, Singers and Elocutionists Sitting in Chairs, Holding Guitars and Mandolins.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/931qfttf1r-cor.