MLA
Callahan, Marvin Dixon. 1904. Oxford College Library (Oxford, Ga.), OP 1904. https://digital.library.emory.edu/purl/607gqnkbb6-cor.
APA, 6th edition
Callahan, Marvin Dixon (OP 1904). (1904). [Black-and-white photographs]. Oxford College Library (Oxford, Ga.). https://digital.library.emory.edu/purl/607gqnkbb6-cor.
Chicago
“Callahan, Marvin Dixon.” Black-and-white photographs. Early Emory College Photographs, 1904. OP 1904. Oxford College Library (Oxford, Ga.). https://digital.library.emory.edu/purl/607gqnkbb6-cor.