Cite

[Photograph of saddled horse drinking from a river]

MLA

[Photograph of Saddled Horse Drinking from a River]. 1915. https://collections.library.yale.edu/catalog/11683466.

APA, 6th edition

[Photograph of saddled horse drinking from a river]. (1915). [Photographs, Slides (glass)]. https://collections.library.yale.edu/catalog/11683466.