MLA

Ritter and Banner Disappear behind the Ridge That Separates Thousand Island Lake from Garnet Lake. 35. 0AD. https://collections.library.yale.edu/catalog/2015419.

APA, 6th edition

Ritter and Banner disappear behind the ridge that separates Thousand Island Lake from Garnet Lake. 35. (0 C.E.). [Photographic prints, Photographs, Stereographs]. https://collections.library.yale.edu/catalog/2015419.