Cite

[Photograph of an unidentified man on horseback with tents]

MLA

[Photograph of an Unidentified Man on Horseback with Tents]. 1884. https://collections.library.yale.edu/catalog/2018176.

APA, 6th edition

[Photograph of an unidentified man on horseback with tents]. (1884). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2018176.