MLA

James, George Wharton, 1858-1923.Jackson, William Henry, 1843-1942. 232. Bridge over the Yellowstone River. Folder 5C. undated. https://collections.library.yale.edu/catalog/2011337.

APA, 6th edition

James, George Wharton, 1858-1923.Jackson, William Henry, 1843-1942. (["Folder 5C"])(undated)[232. Bridge over the Yellowstone River]. https://collections.library.yale.edu/catalog/2011337.