MLA
Co., E. C. Kropp. Milk Cart, New Orleans, La. : an African American Woman Standing in the Back of a Milk Wagon, with Two Milk Cans, Ringing a Bell, the Wagon Is Being Pulled by a Horse [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/97634tmpkj-cor.
APA, 6th edition
Co., E. C. K. Milk cart, New Orleans, La. : an African American woman standing in the back of a milk wagon, with two milk cans, ringing a bell, the wagon is being pulled by a horse [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/97634tmpkj-cor.
Chicago
Co., E. C. Kropp. “Milk Cart, New Orleans, La. : an African American Woman Standing in the Back of a Milk Wagon, with Two Milk Cans, Ringing a Bell, the Wagon Is Being Pulled by a Horse [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/97634tmpkj-cor.