Letter, to J.W. Cross, I am delighted with the success...
MLA
Eliot, George, 1819-1880. Letter, to J.W. Cross, I am delighted with the success.... Box 7. [1885]. https://collections.library.yale.edu/catalog/10001153.
APA, 6th edition
Eliot, George, 1819-1880. (["Box 7"])([1885])[Letter, to J.W. Cross, I am delighted with the success...]. https://collections.library.yale.edu/catalog/10001153.