MLA
Rotograph Co. (New York, N.Y.). A troubadour. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1676t1g1p4-cor.
APA, 6th edition
Rotograph Co. (New York, N.Y.). (unknown)[A troubadour]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1676t1g1p4-cor.
Chicago
Rotograph Co. (New York, N.Y.), A troubadour, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1676t1g1p4-cor.