MLA
Souvenir Post Card Co. (N.Y.). Nut cake vender. February 7, year unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm642r-cor.
APA, 6th edition
Souvenir Post Card Co. (N.Y.). (February 7, year unknown)[Nut cake vender]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm642r-cor.
Chicago
Souvenir Post Card Co. (N.Y.), Nut cake vender, February 7, year unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm642r-cor.