MLA
African American Soldier Fred Gregory Posing with a Firearm in Front of an American Flag. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/511xd254bs-cor.
APA, 6th edition
African American soldier Fred Gregory posing with a firearm in front of an American flag (Box 70). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/511xd254bs-cor.
Chicago
“African American Soldier Fred Gregory Posing with a Firearm in Front of an American Flag.” 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/511xd254bs-cor.