MLA
The Colored Folks Baptizing in Elk Horn, Georgetown, Ky. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/0752fqz630-cor.
APA, 6th edition
The colored folks baptizing in Elk Horn, Georgetown, Ky. (Box 73). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0752fqz630-cor.
Chicago
“The Colored Folks Baptizing in Elk Horn, Georgetown, Ky.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0752fqz630-cor.