MLA
Souvenir Post Card Co. (N.Y.). A little chocolate drop : an African American woman sitting on a porch holding a baby. May 3, 1907. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/525k98sf9b-cor.
APA, 6th edition
Souvenir Post Card Co. (N.Y.). (May 3, 1907)[A little chocolate drop : an African American woman sitting on a porch holding a baby]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/525k98sf9b-cor.
Chicago
Souvenir Post Card Co. (N.Y.), A little chocolate drop : an African American woman sitting on a porch holding a baby, May 3, 1907, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/525k98sf9b-cor.