MLA
Valentine, and Sons. Coke Ovens, Connellsville, Pa. [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/52908kprvn-cor.
APA, 6th edition
V., & S. Coke ovens, Connellsville, Pa. [hand colored] (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kprvn-cor.
Chicago
Valentine, and Sons. “Coke Ovens, Connellsville, Pa. [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kprvn-cor.