MLA
Souvenir Post Card Co. (N.Y.). Vegetable vendor. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5br-cor.
APA, 6th edition
Souvenir Post Card Co. (N.Y.). (unknown)[Vegetable vendor]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5br-cor.
Chicago
Souvenir Post Card Co. (N.Y.), Vegetable vendor, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5br-cor.