Cite

[No. 77: Photograph of two men overlooking mountains]

MLA

[No. 77: Photograph of Two Men Overlooking Mountains]. 1915. https://collections.library.yale.edu/catalog/11680091.

APA, 6th edition

[No. 77: Photograph of two men overlooking mountains]. (1915). [Photographs, Slides (glass)]. https://collections.library.yale.edu/catalog/11680091.