MLA
Souvenir Post Card Co. (N.Y.). Loading tobacco in the fields : African American men loading tobacco onto a horse-drawn cart, with other men and women watching. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x96-cor.
APA, 6th edition
Souvenir Post Card Co. (N.Y.). (unknown)[Loading tobacco in the fields : African American men loading tobacco onto a horse-drawn cart, with other men and women watching]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x96-cor.
Chicago
Souvenir Post Card Co. (N.Y.), Loading tobacco in the fields : African American men loading tobacco onto a horse-drawn cart, with other men and women watching, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x96-cor.