MLA
A Happy Worker (Coal Woman of St. Thomas, D.W.I.). Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 77. https://digital.library.emory.edu/purl/996k0p2nhh-cor.
APA, 6th edition
A happy worker (coal woman of St. Thomas, D.W.I.) (Box 77). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2nhh-cor.
Chicago
“A Happy Worker (Coal Woman of St. Thomas, D.W.I.).” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 77. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2nhh-cor.