Cite

[Photograph of rock formations]

MLA

Jackson, William Henry, 1843-1942, James, George Wharton, 1858-1923. [Photograph of rock formations]. Folder 5C. undated. https://collections.library.yale.edu/catalog/2011327.

APA, 6th edition

Jackson, William Henry, 1843-1942, & James, George Wharton, 1858-1923. (["Folder 5C"])(undated)[[Photograph of rock formations]]. https://collections.library.yale.edu/catalog/2011327.