Cite

Half Dome at the head of Yosemite Valley. 13

MLA

Half Dome at the Head of Yosemite Valley. 13. 0AD. https://collections.library.yale.edu/catalog/2015151.

APA, 6th edition

Half Dome at the head of Yosemite Valley. 13. (0 C.E.). [Photographic prints, Photographs, Stereographs]. https://collections.library.yale.edu/catalog/2015151.