MLA

Godfrey, Edward Settle, 1843-1932. Undated. Box 15 | Folder 209. n.d.. https://collections.library.yale.edu/catalog/17203726.

APA, 6th edition

Godfrey, Edward Settle, 1843-1932. (["Box 15 | Folder 209"])(n.d.)[Undated]. https://collections.library.yale.edu/catalog/17203726.