MLA
Co., E. C. Kropp. On the Levee, Unloading Cotton [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/334fn2z37v-cor.
APA, 6th edition
Co., E. C. K. On the levee, unloading cotton [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/334fn2z37v-cor.
Chicago
Co., E. C. Kropp. “On the Levee, Unloading Cotton [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/334fn2z37v-cor.