MLA

Eliot, George, 1819-1880. Letter. Box 8. 1884 Nov 24. https://collections.library.yale.edu/catalog/32368868.

APA, 6th edition

Eliot, George, 1819-1880. (["Box 8"])(1884 Nov 24)[Letter]. https://collections.library.yale.edu/catalog/32368868.