MLA
Artvue Post Card Co. (New York, N.Y.). Young men sitting around a campfire, with men in the background sitting next to a tent, at Camp Atwater, in East Brookfield, Massachusetts. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/102c866t54-cor.
APA, 6th edition
Artvue Post Card Co. (New York, N.Y.). (unknown)[Young men sitting around a campfire, with men in the background sitting next to a tent, at Camp Atwater, in East Brookfield, Massachusetts]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/102c866t54-cor.
Chicago
Artvue Post Card Co. (New York, N.Y.), Young men sitting around a campfire, with men in the background sitting next to a tent, at Camp Atwater, in East Brookfield, Massachusetts, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/102c866t54-cor.