Cite

[Photograph of three soldiers and two men in casual dress, in a mess hall]

MLA

Pollock, R. F. [Photograph of Three Soldiers and Two Men in Casual Dress, in a Mess Hall]. 0AD. https://collections.library.yale.edu/catalog/2015408.

APA, 6th edition

Pollock, R. F. (0 C.E.). [Photograph of three soldiers and two men in casual dress, in a mess hall] [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2015408.