MLA
Key, H. W. 1871. Oxford College Library (Oxford, Ga.), Box 1, Folder 25. https://digital.library.emory.edu/purl/361rfj6r5t-cor.
APA, 6th edition
Key, H. W. (Box 1, Folder 25). (1871). [Black-and-white photographs]. Oxford College Library (Oxford, Ga.). https://digital.library.emory.edu/purl/361rfj6r5t-cor.
Chicago
“Key, H. W.” Black-and-white photographs. Early Emory College Photographs, 1871. Box 1, Folder 25. Oxford College Library (Oxford, Ga.). https://digital.library.emory.edu/purl/361rfj6r5t-cor.