Cite

Looking back down the valley. 68

MLA

Looking Back down the Valley. 68. 0AD. https://collections.library.yale.edu/catalog/2015451.

APA, 6th edition

Looking back down the valley. 68. (0 C.E.). [Photographic prints, Photographs, Stereographs]. https://collections.library.yale.edu/catalog/2015451.