MLA

Jackson, William Henry, 1843-1942, James, George Wharton, 1858-1923. 117. ...Railway [illegible] Colorado.... Folder 5C. undated. https://collections.library.yale.edu/catalog/2011334.

APA, 6th edition

Jackson, William Henry, 1843-1942, & James, George Wharton, 1858-1923. (["Folder 5C"])(undated)[117. ...Railway [illegible] Colorado...]. https://collections.library.yale.edu/catalog/2011334.