MLA
A Large Crowd of Men, Women and Children Watch as a Group of African American Soldiers on Horseback Ride down the Street. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/846d2547jh-cor.
APA, 6th edition
A large crowd of men, women and children watch as a group of African American soldiers on horseback ride down the street (Box 70). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2547jh-cor.
Chicago
“A Large Crowd of Men, Women and Children Watch as a Group of African American Soldiers on Horseback Ride down the Street.” 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/846d2547jh-cor.