Cite

[Photograph of an unidentified young man seated]

MLA

[Photograph of an Unidentified Young Man Seated]. 0AD. https://collections.library.yale.edu/catalog/2011056.

APA, 6th edition

[Photograph of an unidentified young man seated]. (0 C.E.). [Card photographs, Cartes-de-visite, Photographic prints, Photographs, Studio portraits]. https://collections.library.yale.edu/catalog/2011056.