Letter
MLA
Eliot, George, 1819-1880. Letter. Box 9. 1882 Mar 31. https://collections.library.yale.edu/catalog/32368887.
APA, 6th edition
Eliot, George, 1819-1880. (["Box 9"])(1882 Mar 31)[Letter]. https://collections.library.yale.edu/catalog/32368887.