Cite

[Photograph of soldiers at rest in a field]

MLA

[Photograph of Soldiers at Rest in a Field]. 0AD. https://collections.library.yale.edu/catalog/2017436.

APA, 6th edition

[Photograph of soldiers at rest in a field]. (0 C.E.). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017436.