Cite

[Photograph of an unidentified man in hiking attire crossing a foot bridge]

MLA

[Photograph of an Unidentified Man in Hiking Attire Crossing a Foot Bridge]. 0AD. https://collections.library.yale.edu/catalog/2013352.

APA, 6th edition

[Photograph of an unidentified man in hiking attire crossing a foot bridge]. (0 C.E.). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2013352.