MLA
A Man in a Vest Seated on a Bench under an Arbor over a Sidewalk with a Girl in a Dress Standing against the Arbor on the Opposite Side of the Sidewalk. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21. https://digital.library.emory.edu/purl/450gtht7kt-cor.
APA, 6th edition
A man in a vest seated on a bench under an arbor over a sidewalk with a girl in a dress standing against the arbor on the opposite side of the sidewalk (Box 21). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gtht7kt-cor.
Chicago
“A Man in a Vest Seated on a Bench under an Arbor over a Sidewalk with a Girl in a Dress Standing against the Arbor on the Opposite Side of the Sidewalk.” Black-and-white photographs. Langmuir Deposit - Sept 2020, n.d. Box 21. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gtht7kt-cor.