[Photograph of Siegfried Sassoon and George Sassoon sitting outdoors]
MLA
[Photograph of Siegfried Sassoon and George Sassoon Sitting Outdoors]. 0AD. https://collections.library.yale.edu/catalog/2012312.
APA, 6th edition
[Photograph of Siegfried Sassoon and George Sassoon sitting outdoors]. (0 C.E.). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2012312.