Cite

4. Pompompasus, (Mountains playing Leap Frog) Three Brothers, 4,000 feet above the valley

MLA

4. Pompompasus, (Mountains Playing Leap Frog) Three Brothers, 4,000 Feet above the Valley. 0AD. https://collections.library.yale.edu/catalog/2014926.

APA, 6th edition

4. Pompompasus, (Mountains playing Leap Frog) Three Brothers, 4,000 feet above the valley. (0 C.E.). [Albumen prints, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2014926.