MLA
Founders Week : Historical Day Oct. 9th, 1908. Underground Railway Scene : 1908 Underground Railroad Float in Philadelphia, PA. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/5805x69pc4-cor.
APA, 6th edition
Founders week : historical day Oct. 9th, 1908. Underground Railway scene : 1908 Underground Railroad float in Philadelphia, PA (Box 75). (1908). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5805x69pc4-cor.
Chicago
“Founders Week : Historical Day Oct. 9th, 1908. Underground Railway Scene : 1908 Underground Railroad Float in Philadelphia, PA.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1908. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5805x69pc4-cor.