Cite

[Eric Knight looking on as a man signs a copy of "This Above All"]

MLA

[Eric Knight Looking on as a Man Signs a Copy of "This Above All"]. 0AD. https://collections.library.yale.edu/catalog/2014300.

APA, 6th edition

[Eric Knight looking on as a man signs a copy of "This Above All"]. (0 C.E.). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2014300.