MLA
Erard, C. M. An African American Man with a Beard Seated on a Rock Wearing a Vest, Coat, Hat and Boots with a Cane in His Right Hand. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 51. https://digital.library.emory.edu/purl/747dr7sr1m-cor.
APA, 6th edition
Erard, C. M. An African American man with a beard seated on a rock wearing a vest, coat, hat and boots with a cane in his right hand (Box 51) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/747dr7sr1m-cor.
Chicago
Erard, C. M. “An African American Man with a Beard Seated on a Rock Wearing a Vest, Coat, Hat and Boots with a Cane in His Right Hand.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 51. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/747dr7sr1m-cor.