Cite

[Photograph of guard with rifle and barbed wire]

MLA

[Photograph of Guard with Rifle and Barbed Wire]. 0AD. https://collections.library.yale.edu/catalog/2017485.

APA, 6th edition

[Photograph of guard with rifle and barbed wire]. (0 C.E.). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017485.