MLA
Thorpe, Miss. Portrait of Booker T. Washington in a Suit. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 18. https://digital.library.emory.edu/purl/436tx95xhg-cor.
APA, 6th edition
Thorpe, M. Portrait of Booker T. Washington in a suit (Box 18) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95xhg-cor.
Chicago
Thorpe, Miss. “Portrait of Booker T. Washington in a Suit.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 18. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95xhg-cor.