MLA
Rieder, M. A Field of Sweet Peas : an African American Man in a Field of Peas [Hand Colored]. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/030prr4xkg-cor.
APA, 6th edition
Rieder, M. (1908). A field of sweet peas : an African American man in a field of peas [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/030prr4xkg-cor.
Chicago
Rieder, M. “A Field of Sweet Peas : an African American Man in a Field of Peas [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1908. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/030prr4xkg-cor.