Cite

A foothill valley on the way into the mountains. 8

MLA

A Foothill Valley on the Way into the Mountains. 8. 0AD. https://collections.library.yale.edu/catalog/2015139.

APA, 6th edition

A foothill valley on the way into the mountains. 8. (0 C.E.). [Photographic prints, Photographs, Stereographs]. https://collections.library.yale.edu/catalog/2015139.