[Photograph of glacial erratics in Alaska]
MLA
[Photograph of Glacial Erratics in Alaska]. 0AD. https://collections.library.yale.edu/catalog/2014880.
APA, 6th edition
[Photograph of glacial erratics in Alaska]. (0 C.E.). [Photographic prints, Photographs, Snapshots]. https://collections.library.yale.edu/catalog/2014880.