Cite

To the north of the trail lies Mt. Donahue (left) and an unnamed peak to the right. 30

MLA

To the North of the Trail Lies Mt. Donahue (Left) and an Unnamed Peak to the Right. 30. 0AD. https://collections.library.yale.edu/catalog/2015220.

APA, 6th edition

To the north of the trail lies Mt. Donahue (left) and an unnamed peak to the right. 30. (0 C.E.). [Photographic prints, Photographs, Stereographs]. https://collections.library.yale.edu/catalog/2015220.