MLA
Market Street from Thirteen Street, Harrisburg, Pa. 1807. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/054kkwh72d-cor.
APA, 6th edition
Market Street from Thirteen Street, Harrisburg, Pa. (Box 71). (1807). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/054kkwh72d-cor.
Chicago
“Market Street from Thirteen Street, Harrisburg, Pa.” Postcards. Robert Langmuir African American Photograph Collection, 1807. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/054kkwh72d-cor.